Malicious PDF — malware analysis report

Static analysis result for SHA-256 12713bebb5f6909c…

MALICIOUS

PDF

77.5 KB Created: 2020-12-27 21:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c87f7282c11206abcec67021806660 SHA-1: ef3a39402d41b73d70aa59a39335aa0480e43c18 SHA-256: 12713bebb5f6909ca4ba135d57813dc22154c563813b3b31529adc2c6164ce03
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link and a link farm. The embedded URLs point to infrastructure commonly used for phishing and distributing malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=8th+grade+age+america
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/2457405.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/5a6f19fa768b88.pdf
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/ecd3769f49.pdf
    • https://naxazutip.weebly.com/uploads/1/3/4/6/134610322/5f4f68190ff3.pdf
    • https://gazetitorujij.weebly.com/uploads/1/3/4/5/134599815/5662902.pdf
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/0350721b539.pdf
    • https://xudibonazo.weebly.com/uploads/1/3/4/3/134353284/39033826770.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/1509722.pdf
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/5904943.pdf
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/dolofebexofefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jevelel/feather_brush_photoshop_free.pdf
    • https://s3.amazonaws.com/bevarolimesale/15145271259.pdf
    • https://uploads.strikinglycdn.com/files/cee39d3f-e148-4d0f-8e0a-0d4b928477be/lusikodabenavavelurigini.pdf
    • https://s3.amazonaws.com/bokelur/anthropology_study_material_for_upsc.pdf
    • https://s3.amazonaws.com/dekogamik/dubrovnik_game_of_thrones_location_guide.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_off0000e8ce.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 2900 bytes
font_01_sfnt_off0000f311.bin
8d2ef4ba5ac23770231e35c5e08d547a0530f12cf1a620718e2485aa397e95ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5240 bytes
font_02_sfnt_off000104b5.bin
dd5b5ccedfacb910cd6043571d189ab2470290bbfabfba44bd8ff94de7656869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10716 bytes

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