Malicious PDF — malware analysis report

Static analysis result for SHA-256 85898cb0c93aec55…

MALICIOUS

PDF

78.4 KB Created: 2021-03-04 13:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4ece6e4815a2cec493ef466c636c5e77 SHA-1: e0f054ce2ae4e62a2b6a3f43e34fdb9275e63917 SHA-256: 85898cb0c93aec5518b7857d17e297d9a1aa5c830819bb8dc4b506b8e5a9c1ec
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs is https://vilenefex.ru/wix?keyword=unresolve+from+queue+import+queue+python, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/wix?keyword=unresolve+from+queue+import+queue+python PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484804/normal_6029fbb595130.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/levubebaretife.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ihc2jjb/vida_sana_saludable_consejos.pdfIn PDF document text
    • https://giminefimir.weebly.com/uploads/1/3/0/9/130969553/97312160216c748.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/xihjdMH/dance_classes_for_older_adults_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/ggyChbF/walad.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/5033493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fd0a25a32bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_601007af2992d.pdfIn PDF document text
    • https://dizorewumuzesab.weebly.com/uploads/1/3/4/0/134012942/zuzefowo_ximeriwevibag_bidupo_tirejal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_602625d4b60ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_2ce99060340848dd8bf156df2fd2be8c.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_921dbab8a06d4f39894413e04307ed45.pdf?index=trueIn PDF document text
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_e9c1b493c90f45348b007dd2c6837554.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86403e32-d85c-4aa1-916d-13fc59aa7a8e/naxelomi.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/types_of_sentences_worksheets_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443c1db1-246a-4ebb-b88a-509224bce622/how_many_merit_badges_for_eagle_palm.pdfIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_2149fe28e9a44d0ebc847d24e4083659.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/jawuvunujoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d2df86-93d5-4535-baa5-89acd1f5c2cb/singer_heavy_duty_sewing_machine_not_picking_up_bobbin_thread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c53b44d-62b3-4f5d-85bf-152a77ead989/the_tangible_kingdom_primer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea828bfe-a2f0-4d30-84bd-e582bae2bf21/14578339050.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_e254d0e2a5bf4334a07d0f633b22c23f.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5212 bytes
SHA-256: fe375f9c6987f21c16f09c5bb72489fa38dcae149f741205bf926766e7fb2d5c
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10852 bytes
SHA-256: 78805ccb36af0543bbab5f236ce66b34409ca4f1d898897f3b30fe3c7507976e

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