Malicious PDF — malware analysis report

Static analysis result for SHA-256 7840bb6d270c342a…

MALICIOUS

PDF

62.3 KB Created: 2020-11-18 16:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60b2705091a59ebcace307936f30b0af SHA-1: e2beee4d42360ccf8189350143801c50826e1615 SHA-256: 7840bb6d270c342aa2e28fffc52cc9298703354a10a756d0e99d3ad6f5476e48
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 PDF files hosted on cloud storage, suggesting a link farm or SEO poisoning tactic. The primary malicious URL, trafffe.ru, is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=7.+s%25C4%25B1n%25C4%25B1f+rasyonel+say%25C4%25B1lar+%25C3%25A7%25C3%25B6z%25C3%25BCml%25C3%25BC+so
    • https://wuxurabe.weebly.com/uploads/1/3/4/6/134608123/buxufu-jekidowomufu.pdf
    • https://werifetez.weebly.com/uploads/1/3/4/6/134696790/kijanad.pdf
    • https://fevonijapa.weebly.com/uploads/1/3/4/2/134234837/8230749.pdf
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/35e5210f1f313.pdf
    • https://mazokozofifux.weebly.com/uploads/1/3/4/3/134305155/jokaxerepawobogakoju.pdf
    • https://sulidisige.weebly.com/uploads/1/3/4/3/134318683/759df74c25cdcb.pdf
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fa05a592a577.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zabevog/text_to_self_connections_lesson_plan.pdf
    • https://s3.amazonaws.com/norozovijalu/greensleeves_easy_piano_free_sheet_music.pdf
    • https://s3.amazonaws.com/jamokaroxoj/holt_mcdougal_algebra_1_online_textbook.pdf
    • https://s3.amazonaws.com/votubukaxogilix/soopa_villainz_hit_list_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b443.bin
bea95e3fb8e96ac757e3256d63474941af7412cb81dcade20b9ce6b20f81de49
pdf-font-stream PDF embedded font (sfnt) at offset 0xB443 5552 bytes
font_01_sfnt_off0000c6b2.bin
18c491241930116d5d3b3b64fbf17e09a19d387008492d723abb6c5c5183bf76
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 11088 bytes