Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe18566594fad51…

MALICIOUS

PDF

63.6 KB Created: 2021-02-20 08:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a899bf9bcd89529891f1d5f46bcafc3 SHA-1: 45bc769efc738b032f806386675a0302dd82be1d SHA-256: cbe18566594fad513b673e7d0a1eb41ebd05ce9a6361f55591febe36ee1f7043
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document's content, disguised as 'Cell reproduction concept map worksheet answers', is a lure to encourage downloads from external URLs. The presence of numerous links, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=cell+reproduction+concept+map+worksheet+answers PDF link annotation
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/pigitilof.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/4888009104408vdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5ffdd347134ad.pdfIn PDF document text
    • http://leaninrzpd.site/how_to_scan_to_email_with_scansnap6yfby.pdfIn PDF document text
    • http://verification-help.com/python_2._7._15_64_bit4v7n7.pdfIn PDF document text
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/3b721336195409.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/8c4278323.pdfIn PDF document text
    • https://zataxusesuta.weebly.com/uploads/1/3/4/3/134311667/d236504c3ea.pdfIn PDF document text
    • http://simkosa.website/anti_theft_alarm_mod_apkdca4l.pdfIn PDF document text
    • https://zipawesijapa.weebly.com/uploads/1/3/4/4/134494223/7c766f12f771a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387420/normal_5fec540ac9ef6.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/lowuwofuxali/16521171416.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/braun_series_9_shaver_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/lobone.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/26527578682.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_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 5376 bytes
SHA-256: ec6b0711a96a96f5e4c178fdb3793c623b7701ba58a6e4c48031d8c66fdaea7e
font_01_sfnt_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 9656 bytes
SHA-256: e717ccae43b29709e65e94b0802117d3b560ded5507ed601bed734f6d68127e7

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