Malicious PDF — malware analysis report

Static analysis result for SHA-256 622922855ac8abd3…

MALICIOUS

PDF

75.2 KB Created: 2021-03-03 00:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 27f8bbbe8f76e7af43d3ae246606b676 SHA-1: b8d772d8088c655e4ce08dc7551d36dea59de8f4 SHA-256: 622922855ac8abd32d51ac46f3945ff065dad96e6c52713b4c49dfbfeb6d7650
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential phishing lure. It contains a link farm with multiple disposable domains and Weebly subdomains, suggesting an attempt to obscure the ultimate destination. The document body, though heavily obfuscated, appears to be a lure related to phone settings, aligning with the 'Apple' brand impersonation and the 'Samsung S6 factory reset' search term found in one of the URLs. The presence of numerous external links indicates a potential attempt to redirect the user to a malicious site for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/lered_duporenomilane_godozumo.pdf.
  • 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://seumenha.ru/123?utm_term=how+do+i+reset+my+samsung+s6+phone+to+factory+settings PDF link annotation
    • https://kegegizexuf.weebly.com/uploads/1/3/4/0/134042356/lered_duporenomilane_godozumo.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/a4db7f78fc58.pdfIn PDF document text
    • https://rapugudunoxe.weebly.com/uploads/1/3/4/0/134012743/8777922.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/kikusuronunag.pdfIn PDF document text
    • https://tabanaxil.weebly.com/uploads/1/3/1/8/131857193/2333626.pdfIn PDF document text
    • https://gekiwudev.weebly.com/uploads/1/3/4/7/134769606/beea6.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/80336685507.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/rafozogiduzuk.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/kafumaxox.pdfIn PDF document text
    • https://lonumuzab.weebly.com/uploads/1/3/4/2/134234730/tukuzifezasuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedilar.rf.gd/nuradupe.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/joliseludekagadanumijap.pdfIn PDF document text
    • http://telewazikenap.rf.gd/61471512180.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/how_do_you_set_the_time_on_a_la_crosse_radio_controlled_clock.pdfIn PDF document text
    • http://xemubekimivimed.epizy.com/rujepeluzamubadegololad.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_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 5844 bytes
SHA-256: 951e93e80b566e900ccc5aba6b613ba946c3315c9d74808372485e1fa8071222
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10616 bytes
SHA-256: 9828a9768c24272add7a441e92a296d00ce533e987aca8eb9475ea035685e73d

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