Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2b07e6b6808000…

MALICIOUS

PDF

70.6 KB Created: 2020-11-18 14:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5906abcafee4553fb72c1e8787e7931f SHA-1: 19cf422088382a7fcc1248eac7e523549b457e38 SHA-256: 8b2b07e6b6808000451beaf80ac42c27985d82072f146e4227c9f661569700a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://trafffe.ru/aws?utm_term=boilers+pdf+free
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/zojolotefuzazobek.pdf
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/34dc4378.pdf
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8a929a52592.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8a71ed67d28.pdf
    • https://cdn-cms.f-static.net/uploads/4482623/normal_5fafab9f4a0fa.pdf
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fae14b67097b.pdf
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fa838810e2d7.pdf
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f9e4ada77eeb.pdf
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fa5a0bfab25b.pdf
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/4349f642005f31.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5f8d9781b577f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zarusegibitumet/warhammer_40k_ork_datasheets.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_off0000cd95.bin
f0c8b3abcfbb23567db576d3e8f06ed10c4493183bf1381a1a10343765791816
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 4476 bytes
font_01_sfnt_off0000dcd4.bin
0af685999f1eb6462c7082ba9c2ddf6f3b0a2bccbbeb3de9afb407abcf910108
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD4 10256 bytes
font_02_sfnt_off0000ffa4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 4324 bytes