Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c7131cff086555…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 20:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5043a35856299c18df5b6e155c3df7 SHA-1: 1b5632e77d28804e60fc5179bfc4355b8d5a72ad SHA-256: c0c7131cff0865556b43052ee369a3341fa8c31e770ec0605f11dd442a21a688
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=sistem+pencernaan+manusia+lengkap+pdf
    • https://static.s123-cdn-static.com/uploads/4406785/normal_6008b89c254d8.pdf
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/lagejesej.pdf
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/jixuwozitiz_zolezusopopedo.pdf
    • https://cdn-cms.f-static.net/uploads/4402507/normal_6035f55c9196c.pdf
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fd70942a3078.pdf
    • https://static.s123-cdn-static.com/uploads/4473890/normal_5fecfce894c82.pdf
    • http://stroiline74.ru/how_to_edit_image_text_in_coreldrawkjmda.pdf
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/5511161.pdf
    • https://static.s123-cdn-static.com/uploads/4412606/normal_60069d196bf11.pdf
    • http://blognews.top/what_is_the_best_stock_trading_strategyv2a96.pdf
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/tubenaba.pdf
    • https://static.s123-cdn-static.com/uploads/4384160/normal_6004b4b3b2b60.pdf
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/8664688.pdf
    • https://cdn-cms.f-static.net/uploads/4407313/normal_6032082486fec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/safago/sutuxam.pdf
    • https://s3.amazonaws.com/tuletivotarupu/ard_mediathek_filme_en.pdf
    • https://s3.amazonaws.com/sepawi/new_york_state_police_report_overlay.pdf
    • https://s3.amazonaws.com/verirejon/sweating_bullets_meme_template.pdf
    • https://s3.amazonaws.com/bidivo/follow_directions_worksheet_for_middle_school.pdf
    • https://s3.amazonaws.com/lodazojamuva/thorax_and_abdomen_anatomy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefe.bin
7499860bb0e16c2209ea973e8e6f09bb39ff18bc04cf75a4656dc1cf8db487f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 3488 bytes
font_01_sfnt_off00010b86.bin
81a27eab7484910847f0d995f3b5397a55d381e9b171947b7b09a41be99484e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 5640 bytes
font_02_sfnt_off00011e9e.bin
faf631e2f9544313ac23434f44f06ca02d649f767c3a8fbdbba051faa6477343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 9992 bytes

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