Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b2eaadd39d7bb4…

MALICIOUS

PDF

80.0 KB Created: 2021-05-08 00:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81fef851b8604976a67250e3bf2382ce SHA-1: 1834740cbab8ff9de9c216224a24ed3fa723d1ef SHA-256: 54b2eaadd39d7bb4635be2162ec461ff4341cd59d1c017d6597681de6380f305
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how+to+use+air+fryer+for+turkey PDF link annotation
    • https://cdn.sqhk.co/xonipavu/jPgpwLs/41451062523.pdfIn PDF document text
    • http://brumbum2.xyz/juxatidukuseroduwonulexin98qf.pdfIn PDF document text
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/gutokumamuju_dirasisuxumala_zezoxabopug.pdfIn PDF document text
    • http://artrosil.xyz/thetford_c400_cassette_toilet_seal_replacementzcxy7.pdfIn PDF document text
    • http://esagafow.fun/zulatogiwemekosavosaikvdh.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/noxogodezezaxuso.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/34309944417tu30p.pdfIn PDF document text
    • https://cdn.sqhk.co/figesuweno/2ifhbgf/vibope.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/xjbc9rX/53836049699.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/77753b860.pdfIn PDF document text
    • https://sipebiwamedewor.weebly.com/uploads/1/3/4/7/134707389/849ac38a59.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/gfZ8zii/happy_birthday_card_for_friends_image.pdfIn PDF document text
    • https://xadijonoru.weebly.com/uploads/1/3/3/9/133997446/wimilopapoz-tumuvizaburaza-wariwobojigenak.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/8057348.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/2661cdae-4a57-4cce-baa1-45437370da23/tuxawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1836763-ad62-4c6c-a67d-44c96296f28a/how_to_make_easy_open_gift_wrap_packaging.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_ad18e99d238c4c4290d40649a47f96e2.pdf?index=trueIn PDF document text
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_17097b89c1b341f983a0c10ca2ff5bfd.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a4459ea2efc34c6485d035c3023d131c.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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 4948 bytes
SHA-256: aee27ea21337127fe5aa572d82fd83771039e063963029f17c2f9b84d29a574c
font_01_sfnt_off00010971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10971 11500 bytes
SHA-256: d4a4ea6324fb30400575b391e6940606c52eff58a8b2fbc397aa2065206fe626

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