Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc715682754d9d66…

MALICIOUS

PDF

72.4 KB Created: 2021-04-01 18:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f36c397b0703ebfb26a959b2171308e2 SHA-1: 7399c1874985e8cfc5d00c8918115ba405f16065 SHA-256: dc715682754d9d662f6df005b9a6917a5b56255bdb0a2d250ce8fb0c5210de7b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is detected as a phishing trojan by ClamAV. The embedded URLs suggest an attempt to redirect users to malicious or deceptive content, likely for malware distribution or phishing purposes. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=capsim+consumer+report+tutorial+answers
    • http://doordash.link/86551306603dij0c.pdf
    • http://libertinemodels.com/7215243009sbkim.pdf
    • https://kopupoko.weebly.com/uploads/1/3/4/4/134471128/1676493.pdf
    • https://cdn.sqhk.co/livejizilul/b47jdat/85505405142.pdf
    • https://nasewinadomev.weebly.com/uploads/1/3/4/5/134521200/bunegizuvo.pdf
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/77db9cd.pdf
    • https://cdn.sqhk.co/linaxezo/iggfRZe/scratch_pong_tutorial.pdf
    • https://cdn.sqhk.co/gimanoretev/gOqjenf/xezaluzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_c21669233d8d4b70ac250c509bf659cb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84ed18ed-def5-4bf9-b1f1-2260ec24b3dc/how_to_pronounce_english_american_accent.pdf
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_c4793767e51f4aaca008382c39dca266.pdf?index=true
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_2549b645b4ad4cf6a6d5cbad227c5448.pdf?index=true
    • https://uploads.strikinglycdn.com/files/300e394c-286e-4fc3-914b-9285c7176092/who_are_the_biggest_internet_providers.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_64376abd23ad4283871f03b12acc038b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/140f6ee3-2088-49ce-95fc-761468e785f1/timex_indiglo_leather_strap_watch.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_d54379fb54284c6cbc0978c8aa56743c.pdf?index=true
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_983255653df54ca8944de7eb6438c841.pdf?index=true
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_a564bd34ceb449e08abb1fd81e8d3628.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db51.bin
33b8ddd3f6bdb32a1589376323e098882d9634250c89962d36a31e0f5dc99af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 5076 bytes
font_01_sfnt_off0000ec89.bin
13f97cc658cef15f461eba74bfee8198aa85e0f5381bca5ef31b4d3a726965c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 11680 bytes

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