Malicious PDF — malware analysis report

Static analysis result for SHA-256 7043c7b73ad96ddf…

MALICIOUS

PDF

66.1 KB Created: 2020-12-21 18:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9f5b3858ed2b3853663d013fb97cade8 SHA-1: 99968d099381555bf79c99bf058e4373be8fd8cf SHA-256: 7043c7b73ad96ddfcb808366f04af01ca37a1fe0ec09883d2d7b63934cd95d15
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs, including one pointing to 'traffine.ru', suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/aws?utm_term=acrobat+reader+11+italiano+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fdb90976a815.pdfIn PDF document text
    • https://vejegiraforid.weebly.com/uploads/1/3/4/3/134311029/bitawomuvun_kitotusesid_limuniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_5fbf4d888b9d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_5fc45986ed722.pdfIn PDF document text
    • https://tojezupemizeraw.weebly.com/uploads/1/3/4/6/134629845/9573265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_5fb98686d0458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fc10fdc9cd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_5fc21e0861c01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc67172bdb33045eee820f7/t/5fcdedfc920f47545bb745fe/1607331326611/whole_wheat_sandwich_bread_recipe_vital_wheat_gluten.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/circus_baby_pizza_world_map.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a18fea4a794d564a4325/t/5fc5574961e25426e1e97b4b/1606768457018/computer_systems_a_programmers_perspective_solutions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc8017ec1b6f236570e6876/1606943104146/zotosegutimo.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/69499134772.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c14b27a199023ace2433/t/5fc5197df81c9a2a0c451496/1606752639156/honey_bun_recipe_cake.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38E 5020 bytes
SHA-256: 91870dd2033ac02d23b9b8f7fc1df1953fe091260e027d3a0e695a4ddbdfa54a
font_01_sfnt_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 12428 bytes
SHA-256: 767d423e5f81113a86fb65d2e132929276c7f241ce331fffd66bda1deace5d79

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