Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc34733ef463fba9…

MALICIOUS

PDF

86.5 KB Created: 2021-03-09 22:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41bdc24b7a453529b5c66afdec69eacf SHA-1: 98c3e136866651183a5f33393cf207fd178c8258 SHA-256: bc34733ef463fba983dc2751fa5f77386854da1b0b3e30a741bf3e06470d1eff
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it is part of a link farm designed to redirect users to malicious sites. The document body, though partially corrupted, suggests a lure related to 'Libro de fisica cuantica para principiantes pdf'. No scripts were extracted, but the presence of numerous external links points to a likely attack pattern of redirecting users to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=libro+de+fisica+cuantica+para+principiantes+pdf
    • https://cdn.sqhk.co/zezerixuwab/lChh55t/15745592677.pdf
    • https://cdn.sqhk.co/texivewa/hR9Xhj5/86136629690.pdf
    • https://cdn-cms.f-static.net/uploads/4453743/normal_6028e2445820f.pdf
    • https://vasefifux.weebly.com/uploads/1/3/1/3/131382239/zirawuzapu.pdf
    • https://cdn-cms.f-static.net/uploads/4392441/normal_6023c64301cc7.pdf
    • https://static.s123-cdn-static.com/uploads/4481161/normal_5fe1881b0e8f4.pdf
    • https://cdn-cms.f-static.net/uploads/4479460/normal_602e38b892e90.pdf
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/1787178.pdf
    • https://cdn-cms.f-static.net/uploads/4486368/normal_601886d3750d1.pdf
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/gapaxalimuku.pdf
    • https://cdn.sqhk.co/jejekije/nijvqPE/nuwuvabesasuv.pdf
    • https://cdn-cms.f-static.net/uploads/4456166/normal_6027becc27e6d.pdf
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/kifudina_vidawi.pdf
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fdff1b13ab98.pdf
    • https://cdn.sqhk.co/murajefovel/MhjhiiE/mcqueen_drift_cars_3_super_car_racer.pdf
    • https://cdn-cms.f-static.net/uploads/4467936/normal_5fd10db6a53a8.pdf
    • https://cdn.sqhk.co/sifajoxojif/hiST3dv/30085551798.pdf
    • https://cdn.sqhk.co/sevigexew/hbsijkZ/tv_show_quiz_and_answers_uk.pdf
    • https://cdn.sqhk.co/puwokiraf/ZhjjapF/cabinet_manual_rwanda.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/aeb9f6cda1af.pdf
    • https://cdn-cms.f-static.net/uploads/4456378/normal_60325a6994f09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_c3f3d734bc9243ff96b19bb685d25cac.pdf?index=true
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_539df7ae6f794e3a9b758359d255bf38.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_c167e16589144625bfabe0061b567b2a.pdf?index=true
    • 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_off00011145.bin
749bbffb81461e0478883687ea4d19bf44ad778cdf2191c88217232df41be633
pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 5200 bytes
font_01_sfnt_off00012306.bin
19b201814ab070ce80c8f0ab8356991ff6fac36780531e21af10aae8a5a97c2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 12268 bytes