Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa6f231c015ff67…

MALICIOUS

PDF

79.6 KB Created: 2021-03-09 14:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7ceeb5c27ce8e6c202a0efa989599890 SHA-1: 7cf76b1ac87f2dc6843629f4a02704fd7dc0ace7 SHA-256: afa6f231c015ff67bc5f1a921415363cf811d46d53fe33e37d362a7c06298d6a
186 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to service manuals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=yanmar+marine+diesel+engine+service+manual PDF link annotation
    • http://ing-cliente.com/can_i_get_my_tax_refund_on_a_prepaid_card3muzv.pdfIn PDF document text
    • http://moitender.org/kevosafasezatujunebevoxboa3.pdfIn PDF document text
    • https://livugazenexaru.weebly.com/uploads/1/3/1/6/131607095/dufiwa.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/foseluxogogowil.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/a53915090.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/d8240.pdfIn PDF document text
    • http://discout.online/short_stories_in_english_writtennbuuf.pdfIn PDF document text
    • http://capridigi.com/rsum_du_petit_chaperon_rouge2obd3.pdfIn PDF document text
    • http://lufoveferezudu.22web.org/17692754942.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/262c0f80ef167bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_1ac65dc63abe4c908d5b62d0ada6e389.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0d99da-4352-4302-bf16-963738abcf35/how_to_make_phthalo_blue_green.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_6c2a1d1ef67b4153a5da8d1703ab54bc.pdf?index=trueIn PDF document text
    • http://wonenuw.epizy.com/transunion_consumer_credit_report_codes.pdfIn PDF document text
    • http://wivovazu.epizy.com/wojevilatorozesemako.pdfIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_e8ab563026db4437bc978631697e9367.pdf?index=trueIn PDF document text
    • http://buvumurasamaku.rf.gd/premarital_counseling_methodist_church.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2281c05a-8fd1-43af-a88e-0fc2e3fe6bac/39204669560.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/how_do_i_connect_my_plantronics_cs540_wireless_headset_to_my_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a39eee0-17e5-4bd9-9f75-b24be13a1e3d/gesaxapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb07786-04ea-4901-9270-11380d9c1412/jenaxowoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/babumotulutatosogemil.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_4f3278b248214a31adbb1fd70245c371.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 4972 bytes
SHA-256: c52f7a9a066f10e5a6bb7c5f37aacf407bb7aaf45c645e8c889c9fca818112fb
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 10692 bytes
SHA-256: caebcc97d29d57fd6d8c6b8bd98834cd29c696abc130de18967267d289db7a40
font_02_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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