Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb529ba40b38415…

MALICIOUS

PDF

66.5 KB Created: 2020-12-24 20:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ba598c66b407ea9f172da2ffb215c48 SHA-1: b5a03e69cd5ebaf349d540301ee03725ecd787d1 SHA-256: 5bb529ba40b38415a4347acad0eb3ec6bd0be59b68492e760c9bd9e4f13c5667
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The primary external URI, 'https://trafftec.ru/aws?utm_term=aspera+f28+instruction+manual', suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=aspera+f28+instruction+manual
    • https://cdn.sqhk.co/zevivovakok/i4jhejf/84804119353.pdf
    • https://sipopupomiva.weebly.com/uploads/1/3/4/3/134307082/tebiwuxik-karoruvalesun-ruvuxexopatas.pdf
    • https://cdn.sqhk.co/fofasafiwi/djg9y3h/create_free_blog_or_website_tutorial_youtube.pdf
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/tototajebetisero.pdf
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/cd3ad29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ff2bdbc-cc81-4475-8312-383fa980fdaa/insan_kaynaklar_ynetimi_kitab.pdf
    • https://uploads.strikinglycdn.com/files/10f445c2-9d34-4d2b-8723-d7d6eb742e7e/97685183806.pdf
    • https://s3.amazonaws.com/vipinib/pusikobuje.pdf
    • https://s3.amazonaws.com/zurovajij/algebraic_topology_download.pdf
    • https://s3.amazonaws.com/regegozumekoza/halloween_kid_craft_paper_pumpkins_template.pdf
    • https://uploads.strikinglycdn.com/files/50fe3802-b56f-46cd-8564-884d898e4a70/81193126488.pdf
    • https://s3.amazonaws.com/besafefaf/cronin_s_hornpipe_sheet_music.pdf
    • https://s3.amazonaws.com/jesidofefe/book_review_format_template.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_off0000c673.bin
613379565fc7e35e4c085fae8e50298fd2025d91180f6d7a53d6a9ae0ab0935f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 5476 bytes
font_01_sfnt_off0000d8fe.bin
e5a312a35b57988472dc1117c72bcb15091726fceacd692989ae6b655c17e227
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10760 bytes