Malicious PDF — malware analysis report

Static analysis result for SHA-256 a927ee7b1741aab9…

MALICIOUS

PDF

65.7 KB Created: 2021-04-01 05:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 385270f5659b0b20943fcd584ee6eb13 SHA-1: aa731c0718359ceeb07dfcc783d95eaa497b2aeb SHA-256: a927ee7b1741aab984f71dd408e96f0c10d129a6190282604233b3f1c49781d2
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 0.9997

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/wix?keyword=skyrim+skill+books+achievement PDF link annotation
    • https://vomukefepa.weebly.com/uploads/1/3/1/8/131872153/9169164.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/xesepororinus.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/xumebolikedarek-wudofobetugula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_5fd64ef946f54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_60482d3abd36b.pdfIn PDF document text
    • http://kozojorakipen.iblogger.org/sasexukolejeje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6056d07496fdf.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/3f6a932d-45ab-4e6e-8d4f-5233e348dd28/born_a_crime_quotes_with_page_numbers.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_3e8622d9686441ccabd02ba978873a5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52dcbf5-5cb7-4ede-9842-cccb8c1ff15e/outlander_season_5_episode_1_amazon_prime_uk.pdfIn PDF document text
    • http://mesepojo.rf.gd/26134330756.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_07cd6b4b0e43484c96f843c57c6ca3d6.pdf?index=trueIn PDF document text
    • http://lavebaku.rf.gd/airac_cycle_1805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9e225f-0241-48a9-9f4f-7dd77ed049d1/mepubuvuwudakunetona.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_69b00ed56c894ae8b3cdb21eab6ceaf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a2d4d7-92db-45d6-9863-d1dcb2f634c5/can_turtle_beach_800x_work_on_ps4.pdfIn PDF document text
    • http://dapuvutajula.rf.gd/dibawomamizonoxef.pdfIn PDF document text
    • http://kuxorexijamez.rf.gd/71878153268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06709b68-747c-4a9c-a770-5a905ee07774/potexitutujuxox.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_a9b678f8b52c4d6495628787431cff72.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8f6ec65ade9340afbef8f256ba31e838.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_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 5508 bytes
SHA-256: 9ae8dbf7d83f3211bca16f768042f8ea844deb820b33a6370c034305151d5dfa
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 9392 bytes
SHA-256: dab711d26b05b4a291e401dc164adbc90db921b2651f3ae1c2bb4a166ad2aa06