Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ff7c1828a934ff…

MALICIOUS

PDF

128.7 KB Created: 2021-04-16 18:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d82a60a7c66f53b9edffe862db9fdf6 SHA-1: 8abc18c37f5b453a874021d112af546a9250d874 SHA-256: 64ff7c1828a934ff450437b3b77a449501b892744931ef45f813705caaab6754
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Medication dictionary pdf'. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=medication+dictionary+pdf
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fde3ee145505.pdf
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ffea84a18c97.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/169b799a114.pdf
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fda8165c9598.pdf
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/8484176.pdf
    • https://nuranisemamev.weebly.com/uploads/1/3/5/3/135324344/magede-jupodukixagazu-wazisapenu-mifepe.pdf
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/midebumefonademoxir.pdf
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5ff9f492986e1.pdf
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/dopinami-kigapovimako-tularowugawevox-kenubemavedo.pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_6037f72203ac8.pdf
    • https://favimorujupufu.weebly.com/uploads/1/3/2/7/132710565/1488676.pdf
    • https://cdn-cms.f-static.net/uploads/4480889/normal_5fe8dac19e024.pdf
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5ff935b2eeda9.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_6028a50adfb34.pdf
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/1210534.pdf
    • https://cdn-cms.f-static.net/uploads/4421940/normal_6011b42933d72.pdf
    • https://cdn-cms.f-static.net/uploads/4486368/normal_6060e43b3927e.pdf
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/2029954.pdf
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/4849128.pdf
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/xafufiz_xuvasuvemuzasip.pdf
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6047eb22a2779.pdf
    • https://cdn-cms.f-static.net/uploads/4460057/normal_6047784625602.pdf
    • https://cdn-cms.f-static.net/uploads/4409246/normal_6015bd428c22b.pdf
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/7986612.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0001bfbd.bin
286b2d797055c01e4c246119a3a039afcc920834bd66096acc9c093862ffa43c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFBD 5044 bytes
font_01_sfnt_off0001d10d.bin
3a5e70178a90bbada304e19fec0cf118be54888a617b8f35343eb3b67fa7b753
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D10D 10548 bytes