Malicious PDF — malware analysis report

Static analysis result for SHA-256 f352f3371fa6cbec…

MALICIOUS

PDF

90.2 KB Created: 2021-04-20 15:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0492d536a7ab9d3403f896e4b3d1717a SHA-1: 5fd567921f1ef69a113289268a4a2f73d254be7f SHA-256: f352f3371fa6cbecb9e93e23a79892f29afa96cf9183197926e4cc7fb16670e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to drive traffic or host malicious content. The primary URL, https://midufefew.ru/strik?utm_term=geospring+water+heater+filter, is likely the intended destination for users, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://midufefew.ru/strik?utm_term=geospring+water+heater+filter PDF link annotation
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/ladirubogowin.pdfIn PDF document text
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/fefenipozuxub-nanopiref-botevelobor-vofebiduxix.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/air_pollution_information_in_english_free_download.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/1346d76e178e2f.pdfIn PDF document text
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/6191413.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/72243746534.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/types_of_biasing_of_transistor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_79b1dc6662004878865d8a74f05ac118.pdf?index=trueIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_d8045a2583294a8ab3e8a6e9e6cab98d.pdf?index=trueIn PDF document text
    • http://gezixus.myartsonline.com/59223278515.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_1c8aaa5c9c264f2ca8efbf27e986c62c.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_ccca83c4bfb54db6bdb79adf5c60e561.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_0cbda9a6149e4fbf849d1c3bb99fe909.pdf?index=trueIn PDF document text
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_061e1a9cf9ee40aba2f68f1442236bc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9db026-3a59-49f7-af95-372208b96fad/garmin_vivosmart_3_watch_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fccd32-1866-41fb-a8bb-8b536606470c/75896391301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7fa66c-6566-4127-acf0-d3adef871021/hp_pavilion_dv6_disassembly_guide.pdfIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_7715ea51c2ad4062976b50b9d1b2e26b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a40335-955e-4ef1-bf15-2c03caced8d7/29163716122.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_525e1ed2440742d19cabba9a044e4abb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a6a049-b85a-4b6a-a2bb-389a0f74e26d/30355903824.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_6459a18657994ead9b24cc473c315f4d.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_22cb17246806434596966d340badc58f.pdf?index=trueIn PDF document text
    • http://pikubub.onlinewebshop.net/tedurogeputababu.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_8cf635bfe8ce400091792a9fe1f8a5b9.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_91b83f9912d44d62897348f14cca8144.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 5284 bytes
SHA-256: 1b82e292ac3507c7009ad4c99bbd30994e6a70d7ab6fe0eb0060b61d40490dbc
font_01_sfnt_off000135c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C8 10768 bytes
SHA-256: 240253273f260f8a71f6f2bdd1d2f4e2213babcb73c7a8d1d9092be2cfb94f5c

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