Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a5c3ee1c5fde53…

MALICIOUS

PDF

80.4 KB Created: 2020-12-22 21:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fc4f5e43c9c315d3f7d3568e141fa131 SHA-1: 769808def6b2cb6d24704f5138f9b7028258adab SHA-256: a3a5c3ee1c5fde5353d1a9c569e12e95be6326a62c7ce4d5fd769e28b7019e09
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to downloading software. The presence of multiple external links indicates an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=viva+video+editor+pro+apk+without+watermark PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fb67eee4e457.pdfIn PDF document text
    • https://pimoraruwozego.weebly.com/uploads/1/3/2/7/132712303/5402694.pdfIn PDF document text
    • https://fajalosi.weebly.com/uploads/1/3/4/9/134901252/3184833.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5fda8f3e0d2a4.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/temenazo-povokavamixego-tebagemujuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fb60e04d5f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f99d4287f290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_5fda4e8141f44.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/8580707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/nationalism_in_india_class_10_notes_meritnation.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/pokemon_bronze_brick_uncopylocked.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/80932568134.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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 5168 bytes
SHA-256: 8b6bb6b5060843c405cc1fe0b1d173ab84dbd71cc2fed6888576070015d00d40
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 4440 bytes
SHA-256: b57f53c110a6af6647ed8b6783812de649cdc515eccc74b633a0a780981d5a98
font_02_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 10452 bytes
SHA-256: 944525f8b6f7d9706dd0bf37e2522d297d702db29584f1af1a6c00f355973f56
font_03_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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