Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fcc9fe549c5f6a…

MALICIOUS

PDF

86.4 KB Created: 2021-04-06 02:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2e3c5829e6ee54a849c8bb17068c0a72 SHA-1: e5c81cc03c96f2a17649a9936748471394d8d0f4 SHA-256: 70fcc9fe549c5f6a1cefdc20bc1e365c83f2ccef335439f2aa079b4dd3d113e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a link farm or SEO spam operation. One of the primary external links is to `https://dafemum.ru/strik?utm_term=physics+textbook+for+high+school`, which is likely a lure to a phishing or malicious site. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=physics+textbook+for+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374207/normal_5fd7b7ac5c707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_606ab67e3521f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_f244a09c1afc43c897471b3903a65806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/wukerobulazabitan.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/gijixezavizelebeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b75cf5f-b4cb-48f2-9d99-2bdf1adf62ff/36604654043.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_c45e720c03a74011a0803b7e6bb3437e.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_e2cd9c94eb694a389a05c24034642f26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61c5edb-fa12-4593-8f46-0e8be601ad72/first_day_of_school_2020_florida_hillsborough_county.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_8d96c4c9748d478fa025215c3462e6e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/13751509663.pdfIn PDF document text
    • https://78a3f932-2eca-4366-91b9-d52a2f3c5f58.filesusr.com/ugd/a586f9_02955d5be68f46e8a7f6e8e2eaa5e978.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be2c5bd-b2f7-4ae0-bf9b-248f756db162/2001_kawasaki_mojave_250_service_manual.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_7fef4d3a80db4500be54229573202c61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/526f4cf1-9465-475e-bb70-3b5bee44c743/metal_gear_solid_1_remastered_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3fddf4-6b88-457f-95cc-d578b5308821/99209479449.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/mibodu.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_b7494d258d5d49d49e249a87b48e6033.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_46bd4746f5c14ea08ae9dc9fb2e01264.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninasivol/interior_designing_degree_colleges_in_mumbai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43f3980-1c16-4d18-920e-0071b4ba0fa5/how_to_write_a_great_short_story_-_the_8-point_story_arc.pdfIn 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_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 5308 bytes
SHA-256: 3b0f0d34e6b7f7e71ba96e00f665814306cba0d421673cf507886b7541ad244d
font_01_sfnt_off000126fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FD 10980 bytes
SHA-256: 94bbb2b5c0e836be08ca82c12f45f965fb691023f1951ff41c10c344669d8e3d

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