Malicious PDF — malware analysis report

Static analysis result for SHA-256 22bf0a50fef36a86…

MALICIOUS

PDF

74.1 KB Created: 2021-05-29 15:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de2bde00781845854aeb8c19a84c1997 SHA-1: a8e3b10bd4af9888fd5f9091c891d6085cd3a962 SHA-256: 22bf0a50fef36a868479fe2d39fcbf51148f9d1402898f39d10db5f0de2870e1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, appears to be part of this redirection scheme, likely to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=why+does+my+lazy+spa+keep+cutting+out PDF link annotation
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/moxoripazuwukivawibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481847/normal_5fe6664f4c764.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/33668fecf92.pdfIn PDF document text
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/1654ddbd7940.pdfIn PDF document text
    • https://zuwufapiju.weebly.com/uploads/1/3/5/3/135348861/mofade.pdfIn PDF document text
    • https://xulopoxaxuwuzoj.weebly.com/uploads/1/3/4/5/134509354/8074233.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/91128.pdfIn PDF document text
    • https://rapagifetudi.weebly.com/uploads/1/3/2/6/132682686/rorokumi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_6031126e728cf.pdfIn PDF document text
    • https://dobidikomopal.weebly.com/uploads/1/3/5/3/135302797/lixixovulesanuj-pazufo.pdfIn PDF document text
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/21b64db9b1.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/488ac03d7c46.pdfIn PDF document text
    • https://makigutezun.weebly.com/uploads/1/3/4/7/134707077/343928.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/9293c0767051.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/zojunetu.pdfIn PDF document text
    • https://giwedogifuj.weebly.com/uploads/1/3/4/7/134741463/2339536.pdfIn PDF document text
    • https://dowabibagugodu.weebly.com/uploads/1/3/4/6/134697665/zudulazubo.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/3861884.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/1406881.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/ea9abd23.pdfIn PDF document text
    • https://jifabipesetumef.weebly.com/uploads/1/3/4/8/134896168/9891503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 5620 bytes
SHA-256: ac30c75c0c1f0a0b90b08534e7fcaecb151edf351fc615a7a50a4c8a90691983
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10684 bytes
SHA-256: 0124d7be14c576f166a41a139e9fbad6630c94aa3e7993726bda05f468d0206b