Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4932cd34ff999a…

MALICIOUS

PDF

69.2 KB Created: 2021-02-21 10:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3ae654562dfd4d1fb5f629620ad249a SHA-1: 97b714a14053386bd25c7773cf8b613fb81d9b11 SHA-256: 5f4932cd34ff999a3e1a3ad06c7339a6b89db15bad5b249ac473876e0ecabb66
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://maypoin.ru/wix?keyword=barn+door+guide+wheel PDF link annotation
    • https://cdn.sqhk.co/vemudumuxixu/aigjhhf/641272753.pdfIn PDF document text
    • https://kuboteradaragi.weebly.com/uploads/1/3/1/4/131482952/rudanafu.pdfIn PDF document text
    • http://lbaranaydin.com/11481220600or75g.pdfIn PDF document text
    • http://rajonilelubej.22web.org/fipufutifinelinudef.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/jbjbntw/54828247468.pdfIn PDF document text
    • http://alphabitx.com/gowenagf4jp.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/ogjcVif/kurig.pdfIn PDF document text
    • http://tamowigaxijatot.66ghz.com/nunebogipirar.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/aqih4BB/earn_to_die_2_unblocked_games_24h.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/929c2.pdfIn PDF document text
    • http://winfreeiphone.xyz/tv_channel_logo_quiz_answersarcui.pdfIn PDF document text
    • http://tigimurudel.22web.org/sharper_image_wireless_earbuds_not_charging.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/88b5b394.pdfIn PDF document text
    • https://cdn.sqhk.co/luzigagoguna/X6Gxhak/bujulinugulesogemakiwor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zezexobufimorum.epizy.com/the_witcher_3_wild_hunt_prima_collectors_edition_guide.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/34581117880.pdfIn PDF document text
    • http://soxomidil.epizy.com/rebexabonabezuluxalo.pdfIn PDF document text
    • http://wujukigow.rf.gd/57263310807.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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 5048 bytes
SHA-256: 6f742cc24d23c141af03b705d3b20f8e7e21e2077df14c507b15122299155bce
font_01_sfnt_off0000e431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 10476 bytes
SHA-256: 01b66f47ef07e1957b08a62a516c8fee54e1e42c75cf878f4edb8cfe0b101add

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