Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d45581d537295f7…

MALICIOUS

PDF

82.8 KB Created: 2021-04-24 07:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 050be99e5844378b701f9a47617c1131 SHA-1: 4608b61bfb88865aea6026099e20fa262cbc58e3 SHA-256: 9d45581d537295f77461c74116a1aead989ce188e257f828f24012cb4b6ecb29
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, forming a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute malicious payloads. The embedded URLs and the nature of the link farm point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=college+algebra+clep+practice PDF link annotation
    • http://mopowataxix.medianewsonline.com/41061730410.pdfIn PDF document text
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/2178833.pdfIn PDF document text
    • https://xupajipodiburut.weebly.com/uploads/1/3/0/8/130814024/dukarabebizumi-falidukotunuka-retabuko.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/honeywell_vision_pro_8000_thermostat_wiring.pdfIn PDF document text
    • https://wofirifitobad.weebly.com/uploads/1/3/4/3/134310136/rufexozebewejamolan.pdfIn PDF document text
    • https://sifuparara.weebly.com/uploads/1/3/4/3/134352995/707308.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/gifak.pdfIn PDF document text
    • https://vixojuderapu.weebly.com/uploads/1/3/2/3/132303060/dimop.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/9379624.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/a6d69f547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/732dca8b-5308-4f0f-bbee-c3cb11e31105/fokederinirufifoz.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_498a0b01cfca41f6bd9f8a7d3938ee6b.pdf?index=trueIn PDF document text
    • https://65fca3b3-7ce8-4d56-9bc8-ebe46cc5223b.filesusr.com/ugd/f6ed72_c599c14160cb4bbe8118d304fd7953e3.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_7b2f4cf44acc4ceba9d47b341b538fac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0597ad-e5df-48ce-a81a-3fc29d6d84cc/how_hard_is_it_to_drive_the_road_to_hana_from_lahaina.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_3a0ade1637024a45b0509fa1f2a46b86.pdf?index=trueIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_b27ce4844e48406ea9886c853590224b.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_eea24b5d9cfd4707b5ca36eb78d2c027.pdf?index=trueIn PDF document text
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_add2dcaed63249c1ba4167c86894b362.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8397e6f-c5c3-4f8c-843b-345975bbb13d/are_sat_practice_tests_harder_than_the_sat.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_5ea7ffb18e2249d9bb26ffbf7241dadd.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_4f14bdae927f4fc689ce398252383c4b.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_59f24ed175994b0bafa54316a468296b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 4968 bytes
SHA-256: 052faa722cbad650b9b1d44edf3531d07ece48d88705430f5dbd8d6d06d928ad
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 11336 bytes
SHA-256: 23fcf98fa87a415cf9ae9ca349f5c2deeb64346c2e4bc7febd3f53baf20782e5
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 16088 bytes
SHA-256: 9b6ad5722d12b30ebaf898f562fd4d85af749794f3aca0f1f676e444c262175b

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