Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7bb3b2bd83a6f7…

MALICIOUS

PDF

63.3 KB Created: 2020-11-23 11:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88b40d4cfd34ca8d451f459b20a5f268 SHA-1: d69231c261463c73e7737edeac24cef808fbd849 SHA-256: bc7bb3b2bd83a6f7c2deb782048f3942fca953d79a368d1fcaf1ced49b4d2f11
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards directing users to malicious sites, likely for credential harvesting or further payload delivery.

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://traffnew.ru/123?utm_term=complementary+supplementary+angles+worksheet+pdf
    • https://kirugalepolofaw.weebly.com/uploads/1/3/4/3/134340862/bonuvugel_pageromexipizak_vimoxaraxamumig_sirimij.pdf
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/ludumivaxitu.pdf
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/dideze_wiwaruv_nowujojo_vajotonojujum.pdf
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/3530610.pdf
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/bolitixikoxabove.pdf
    • https://rixekozezoba.weebly.com/uploads/1/3/4/6/134609597/bozofujage_poruzu_mijumegi.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/92f5a42e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waxapoz/ansys_workbench_tutorial_release_14_kent_lawrence.pdf
    • https://s3.amazonaws.com/wovitiku/winijebomupuriziwumu.pdf
    • https://s3.amazonaws.com/fowikorejodi/wufumewiwabefenikug.pdf
    • https://s3.amazonaws.com/sugaguxagu/78872306637.pdf
    • https://s3.amazonaws.com/toliwudalamem/14659469147.pdf
    • https://s3.amazonaws.com/dinilederu/kozagixopironir.pdf
    • https://uploads.strikinglycdn.com/files/3ea11b08-2122-4d78-a188-1a72bb04d605/xujakewaluderaxivibu.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_off0000bc3d.bin
2401a36608c3b48a64bf94500d94babb3ca8df0001f63d25529aa74c7450b1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 5620 bytes
font_01_sfnt_off0000cf44.bin
63fcda27543edf69fc8d601afbd7e012de9be2883856a5a3fee53aa3250ab09a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 9604 bytes