Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f1fb9337739180…

MALICIOUS

PDF

102.2 KB Created: 2020-11-18 08:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 78f04b5950408147a33cae11a191ece7 SHA-1: 7e0f706819f98a7c2247162d0a15fb2dc822ca1e SHA-256: 56f1fb933773918080e86a6a71a990d00e345d7266bc6bacecdd70ba297a725e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'recovery mode apk no root', suggesting a phishing lure. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • 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=recovery+mode+apk+no+root In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_5fa87b70c1e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_5fa49f16a7b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_5fabeec3db673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_5fb4ae6003e0a.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/wuvoseje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fb326fd386f9.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/kalufizefem/xakijuw.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/sm64_rom_hacks_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/kurigerimonimivivadaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b3cc0c-6ecb-4a7d-b08d-acfa75bda985/la_sintaxis_de_la_imagen_resumen_cap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 4984 bytes
SHA-256: 7ccfc076f4b18eafadb8cd33e0ed4a7f7924f18440be2d9c52e656ede6026195
font_01_sfnt_off00014028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14028 11924 bytes
SHA-256: 5e6ecb8011fc7303cfc245c016321242e29223cf705ae496473bfff58fb05982
font_02_sfnt_off0001687f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1687F 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_03_sfnt_off00017d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D46 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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