Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac396c7d81f5848d…

MALICIOUS

PDF

76.8 KB Created: 2021-02-28 04:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7e630fc110afa9ae10fbb3b01e804572 SHA-1: 8304971eebe49688b841bb77d21a270aeaee1578 SHA-256: ac396c7d81f5848d99166f8659bf9b3e4b27b75f2814092b8a16ff0d8045163e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://fokemale.ru/123?utm_term=lack+of+quorum+meaning+in+hindi', indicates a potential phishing or malicious content lure. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/123?utm_term=lack+of+quorum+meaning+in+hindi PDF link annotation
    • http://gunepevoxop.66ghz.com/vusegixolajowomezotoje.pdfIn PDF document text
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/sesudafodavali.pdfIn PDF document text
    • http://wunedefewadonif.22web.org/mellanni_bed_sheet_set_king.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/3334803.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/tecumseh_engine_carburetor_repair.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/82404772032.pdfIn PDF document text
    • http://stickerrus.ru/cholesteryl_chloroformate_synthesisb4u7s.pdfIn PDF document text
    • https://mikovenib.weebly.com/uploads/1/3/0/8/130813447/8246217e67.pdfIn PDF document text
    • https://fubudebuz.weebly.com/uploads/1/3/2/7/132712336/a7a19db2a989ecc.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/3534449.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/3ab9d88fe.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/47186782269.pdfIn PDF document text
    • http://zazerabila.iblogger.org/barish_song_yaariyan_movie.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/841627.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/8309662.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/7f3359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvoxezol.rf.gd/4308367766.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/security_consulting_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/toxoboporudozarovok.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/atrial_fibrillation_guidelines_aha_acc.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_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 5356 bytes
SHA-256: 0c6bc3bf8f0c9919103bf80b0a7c5bf8e5620ac2d6f4b58f35481b8a384a9db0
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11624 bytes
SHA-256: 87aa65f9e783fe57fcc896c30e5822425a134ad42257c46689b1ac760cc9ebd1

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