Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3751be2f1fe2fe…

MALICIOUS

PDF

74.3 KB Created: 2021-01-06 22:21:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d4e5e9df2c29aad3978a0d86c91f6b0a SHA-1: 9c1a584d9f2f666a1d66b85548e084292e74d6c4 SHA-256: aa3751be2f1fe2fedf2d30162fd9cf62a0dc307d1a5339074afc1ea9c057b65a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/aws?utm_term=ffmpeg+beginners+guide PDF link annotation
    • https://cdn.sqhk.co/dajebala/ghgjhja/monnier_freres_ivry_sur_seine_france.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/RiihjG7/grand_truck_simulator_mod_apk_with_license_d.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/Vl1ttw1/dakokobanupenoluvovefivi.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/WqeWgc2/vegipowasebegogumitorida.pdfIn PDF document text
    • https://xumokiregiw.weebly.com/uploads/1/3/4/2/134266049/gelakutodapi.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/crib6jh/vobuta.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/rXihyji/hakuoki_kyoto_winds_trophy_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/agctqjg/deriving_risk_neutral_probabilities.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/83186613307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bc92df-c993-4a15-b980-c2310466c885/jopabesevadikiwejipusili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373cb6fd-cfae-4cca-920c-02e17b9716d2/gomapigapuwerivexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7490d736-15bd-4467-9d01-251282f58f44/joe_vitale_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20eee75e-a6c2-409a-bddf-566b456160be/52323898510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c62cac7-45a1-47c2-ac6a-89ec10074e5a/tc_helicon_play_acoustic_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/fudujazipofokubepafarure.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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5216 bytes
SHA-256: 33282e04e873c4fe078a942f45891b306188f3b3913063b063590de6bf4d788b
font_01_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10792 bytes
SHA-256: 67289a7da57693ca7119da49650dbfa868e79249dfeca4984bd918e38cdb621e

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