Malicious PDF — malware analysis report

Static analysis result for SHA-256 041b1b25bc644f8a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-08 00:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 019ee04c058a8f2859f611aa9f44d862 SHA-1: 46f7f5e186d5772727dd7d5264e0d67db3477cea SHA-256: 041b1b25bc644f8a1d2cb3fba517113e572d2d343695d59a213bfcc398059887
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many pointing to disposable hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=shel+silverstein+poems+where+the+sidewalk+ends+pdf PDF link annotation
    • https://fevenegor.weebly.com/uploads/1/3/1/3/131380973/1632308f.pdfIn PDF document text
    • https://detimuveruriwus.weebly.com/uploads/1/3/1/8/131872178/6491553.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/lsgjh2u/race_tomorrow_night.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/jgdLidA/ballet_vs_hip_hop_movie.pdfIn PDF document text
    • http://delayikapy.xyz/22017385400l9f85.pdfIn PDF document text
    • https://cdn.sqhk.co/zitajazasu/gcjibjf/guvub.pdfIn PDF document text
    • http://50offstore.info/7036055061764i4r.pdfIn PDF document text
    • https://poximixej.weebly.com/uploads/1/3/0/7/130776069/576235e51.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/5jjJdYU/37527437430.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/iAnji13/mlb_scores_astros_schedule.pdfIn PDF document text
    • http://gufutaca3.xyz/govetazelumurukejowiz5ksfd.pdfIn PDF document text
    • http://harmony-market.ru/40765819400gxs24.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/1069894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_37f7ddad58f441fb95186ae3d73e3d2e.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_3c21bcee2d09413a8386e98d57aa1670.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_fa65e3a3b1464971a082ad1fe3132a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bd2f3a-3485-4c80-be89-5857d06cee0b/vologav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da33de72-a459-4560-9e08-61fa87ec8554/87684638.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_892f3be5fc454d7e823feee532c42461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e139de-d0cd-467a-8307-c3b21d250cb1/it_stephen_king_quotes.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_26dd308996844dbc850c11b9672024a0.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f1bd060281894df5bcb67ebbf09f22cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be56826c-b48b-4efb-9790-08371add99af/nadudigikakijawaroxisele.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_4339b40f7fb647a79904d05101f69a9e.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 5600 bytes
SHA-256: dfb0003c46fa7b01043b5bbea74fc5af3b2c051d07148c59ff07020861bfe2a1
font_01_sfnt_off0001088b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 10480 bytes
SHA-256: 2b345ebfa0245bacf10e293fabbf6b0e2838be3fc431038c443edf8d43724bfd
font_02_sfnt_off00012c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9B 18508 bytes
SHA-256: 7d6c7f27ae920b385cd28956894978337f9013cc56150c5b3131f1c601f0ac56

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