Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c445f97075acc53…

MALICIOUS

PDF

78.4 KB Created: 2021-02-15 07:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 199c2166a89b8c57cd4dcad6ef9f69a8 SHA-1: ad651fcf0f0d3ee50cfde056cc1d5ae32c8725d9 SHA-256: 4c445f97075acc531bf9a7c82c3eb2334f1e93ce9bb37b27657d95003d327738
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm detected by heuristics, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a downloader. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users via external links.

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 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://jacksth.ru/aws?utm_term=conversion+of+units+worksheet+for+college PDF link annotation
    • https://cdn.sqhk.co/kewudomavave/jhEZehj/17746766660.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/xanevusilifipiw.pdfIn PDF document text
    • https://kofivenemiwelew.weebly.com/uploads/1/3/1/3/131380814/zolanibog.pdfIn PDF document text
    • https://luroxonigin.weebly.com/uploads/1/3/1/4/131406321/3251193.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/cqggic7/pufivapababiridetoxun.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/5Aghzhc/car_shifter_cover.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fc8089ea7aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404740/normal_60000b810baf4.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/TvzjgsS/matches_puzzle_game_episode_14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/niporofez/374540422.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/rumaretupugidekomomod.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/interesting_information_about_the_vietnam_war.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/cipd_chartered_membership_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/monday_punday_234_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/infertility_nice_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/gudekabukogarixivinunag.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/baba_is_you_igg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 5052 bytes
SHA-256: 5c0e8ba372fd6bb029728c221fc544fe5e19aa9c1b8f8e507d20e9ae623949d9
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 10780 bytes
SHA-256: 220d447e3efac1a69fa82c6c7da30a40e71d7c5e51654dcd950b99a84a084ef8
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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