Malicious PDF — malware analysis report

Static analysis result for SHA-256 781e8285f1eeb9c8…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 13:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1bd17c4445f1772ee8aedb1b9cbad7fa SHA-1: 8b9e6f19c8cc1aab6dd75b06fd573d243b4c8286 SHA-256: 781e8285f1eeb9c8ee89452c3b7af273c8cd926d95487f60a541effa08bf508b
186 Risk Score

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://seumenha.ru/wix?keyword=chemistry+acids+and+bases+worksheet+answers PDF link annotation
    • http://helpcontactform.com/1_metro_cuantos_cm_tieneh4zk4.pdfIn PDF document text
    • http://webdefilmizle.com/the_mortal_instruments_series_by_cassandra_clareaa5jn.pdfIn PDF document text
    • http://invitesistem.ru/sniper_ghost_warrior_2_walkthrough_part_1kfk10.pdfIn PDF document text
    • https://tenemetit.weebly.com/uploads/1/3/2/6/132696414/monumixeba.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/f27152b3873a.pdfIn PDF document text
    • http://lozhobelir.space/gatunewilatanamuseekl17.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/jebonogagelifetej.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/ZghgiYZ/rusolijorobufave.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/zogawo-likeran-vikelewobi.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/uQjijfK/lidugufuguteduxazuvoxaris.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/uF6jwha/sejado.pdfIn PDF document text
    • http://zekofurul.iblogger.org/neil_degrasse_tyson_quotes_masterclass.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/haKQ7Zd/84443278783.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://s3.amazonaws.com/kefiperizonofu/reddit_headphone_amp_guide.pdfIn PDF document text
    • http://vedaremix.epizy.com/information_about_h_boniface_prabhu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 5356 bytes
SHA-256: d00d27bfdbe02238f799d83011b16aa0dcda9f23d46f86ccd4211d37b01f77a7
font_01_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10920 bytes
SHA-256: fedd553c0400b456e7f87ce8c4acc080d8cce675acd268ff1a1916d17baabbf5
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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