Malicious PDF — malware analysis report

Static analysis result for SHA-256 122813c2acb4c2b8…

MALICIOUS

PDF

73.0 KB Created: 2020-11-22 21:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82be4918e15cbd88af66a99b51035759 SHA-1: 7badf6ed6eae59190c5890b9c38d4803694f71dd SHA-256: 122813c2acb4c2b8a5c277184c136b71f8394d8c18cdd8abaa30dd6a86fdd5de
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a strong attempt to drive traffic to potentially harmful sites. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=fundamentals+of+electric+circuits+solutions+6th+edition
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/a2627.pdf
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/tagabopetol.pdf
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/rogirul_betunopan.pdf
    • https://waxagenejefud.weebly.com/uploads/1/3/4/7/134712445/ledepejojurok.pdf
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/pajaponok-nonirunuvu.pdf
    • https://fexaramexi.weebly.com/uploads/1/3/4/6/134642664/7998228.pdf
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/suvemomipap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d9b4e3e4-7eb4-4adb-9417-7605b707c174/matricom_g-box_mx2_specs.pdf
    • https://s3.amazonaws.com/redegelesibif/jquery_slider_animation_effects_free.pdf
    • https://s3.amazonaws.com/devuxuzejozam/tuvokubutop.pdf
    • https://s3.amazonaws.com/nuxepiduded/78844802680.pdf
    • https://s3.amazonaws.com/nagudo/cat_mario_linux.pdf
    • https://s3.amazonaws.com/nuselufuzo/gefimogowefafudumis.pdf
    • https://s3.amazonaws.com/tetazino/dusizoridurafofozizimezi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1b.bin
cf5b5388c9b24815be271dffc8d436dab8dab47835bf9c0adf114e99c7e3ff9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 5372 bytes
font_01_sfnt_off0000f13a.bin
39456fb6ea6cc26589bf984e0ef41e0169693a94a39dcdfb6bc1dfbca9cc5c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 10864 bytes