Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2015f7c0922649c…

MALICIOUS

PDF

118.4 KB Created: 2020-12-22 20:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a06b4260475d683bd7b354dedcaf557a SHA-1: 9869d6fc66c4220b60369a6b9ca0c984e2a320f8 SHA-256: d2015f7c0922649caf11879faf71e1da71f87f183d22af72ade73217803a674c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is indicative of a link farm used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://trafffi.ru/strik?utm_term=asteroid+belt+atmosphere+facts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5f9de28c436fd.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/54e4db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fa8717a3bc7e.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/samopakamefap/84784021370.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/game_stranded_deep_highly_compressed.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/ethiopian_grade_7_mathematics_teacher_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/boboiboy_galactic_heroes_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/99263675025.pdfIn PDF document text
    • https://s3.amazonaws.com/xatojem/how_to_measure_window_for_vertical_blinds.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/remebofoladi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176AF 5524 bytes
SHA-256: 429423b440d096200011531997ea61686612eea869110d412aa8b524af1e5f01
font_01_sfnt_off00018945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18945 13932 bytes
SHA-256: 4e8917e68d84024f4d10bfccee0aa9b2c27d69c79d821376f454c56ef6f4f38d
font_02_sfnt_off0001b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B633 16364 bytes
SHA-256: 99d2a2c808da7dd9dd61e372b460cc1f2abe629cdef286d9195d046f7686783c

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