Malicious PDF — malware analysis report

Static analysis result for SHA-256 8922d0555a0e0afe…

MALICIOUS

PDF

70.9 KB Created: 2021-06-03 11:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac88a2efbfc2a9631657889cc8c4770e SHA-1: 3d2fb8a1037e8a5a2c6f2e31cb7e06b63ffabc32 SHA-256: 8922d0555a0e0afeb97b5900bb30add69efcc2f59ad9ccd1bca5318c84dbba8a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the likelihood of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=technics+sh-8046+manual
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/robijovedop_bozapirakurizun.pdf
    • https://bakavola.weebly.com/uploads/1/3/4/7/134753875/mazowafapov-zijowutize.pdf
    • https://nuramovu.weebly.com/uploads/1/3/4/3/134363108/wapapeledepodope.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/dixowisaji-sufoki-rakilex-pujotopifu.pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/wofonokul-baziwatamani.pdf
    • https://sekirunive.weebly.com/uploads/1/3/4/4/134404638/90994ed45c2.pdf
    • https://putigored.weebly.com/uploads/1/3/0/7/130738503/jaxegilazefopu_sozovekum_suritawupuwone.pdf
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/buxapezovexube-mogekemegan-nimet.pdf
    • https://miwarova.weebly.com/uploads/1/3/4/7/134769624/913953f.pdf
    • https://zuretajobujab.weebly.com/uploads/1/3/1/4/131483148/perurefowiv.pdf
    • https://rewodudifizaba.weebly.com/uploads/1/3/4/4/134475466/3802812.pdf
    • https://volatofe.weebly.com/uploads/1/3/4/4/134442598/950abe24.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/347c4f40-98ce-4611-ad59-d8b9fc22da02/ruzubuxomidulisamomigubav.pdf
    • https://uploads.strikinglycdn.com/files/4fc4dafa-dd19-460c-8860-7c15cea834db/19726260294.pdf
    • http://dijakezepo.pbworks.com/f/tufuzogivu.pdf
    • https://uploads.strikinglycdn.com/files/be41fd1d-cf0e-4c3b-bf93-7de0967c1d51/45874917728.pdf
    • https://uploads.strikinglycdn.com/files/be47391f-191b-4a4c-b94b-738dde0a5bda/68467327184.pdf
    • https://uploads.strikinglycdn.com/files/78a4ceff-6b2f-463d-8258-ae14a29f110f/beethoven_moonlight_sonata_3rd_movement_sheet_music_imslp.pdf
    • http://xelivolofuso.pbworks.com/w/file/fetch/144547794/como_tomar_ciprofloxacino_para_infeco_urinria.pdf
    • http://ronakiko.pbworks.com/w/file/fetch/144552537/zivoxap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d446.bin
4f73b0b4522b6a3a37f3f5564b5db2214a26b495c14b18b326f41b9c92b490af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 5500 bytes
font_01_sfnt_off0000e6e1.bin
732c81b429a2bb8da088a12c11e27f920b4f17b74ca4fd21508833e58d2cc4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 12108 bytes

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