Malicious PDF — malware analysis report

Static analysis result for SHA-256 385f6a4af3cb7cb3…

MALICIOUS

PDF

74.6 KB Created: 2021-06-10 00:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60ba7c589d6589e5daf4059f91d029d SHA-1: ce2dcd0659000a9a4bee702d3fee39c0a2a3bd2c SHA-256: 385f6a4af3cb7cb32b3ad068afebf8979e549f0ed02c97403552669254fca010
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on Weebly and other platforms, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text related to downloading a game, and the presence of a 'Download Now' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=download+game+mobile+legends+bang+bang+mod+apk+offline
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/116e7.pdf
    • https://fasitidepev.weebly.com/uploads/1/3/4/3/134312072/moporisamowodewupi.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/1ce939962e.pdf
    • https://cdn-cms.f-static.net/uploads/4496146/normal_6018f3fc20aac.pdf
    • https://cdn-cms.f-static.net/uploads/4381751/normal_606cd09d2f178.pdf
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/navapofa.pdf
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/genetoxin.pdf
    • https://cdn-cms.f-static.net/uploads/4366973/normal_602ea891b4a6b.pdf
    • https://cdn-cms.f-static.net/uploads/4409236/normal_603c3283bafe1.pdf
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/vozudamapalori.pdf
    • https://static.s123-cdn-static-d.com/uploads/4460968/normal_60b1a05f4e7ed.pdf
    • https://static.s123-cdn-static-d.com/uploads/4425214/normal_60b7250084edf.pdf
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fff108bb074b.pdf
    • https://xuzekivaf.weebly.com/uploads/1/3/1/4/131453918/9376802.pdf
    • https://static.s123-cdn-static-d.com/uploads/4450336/normal_60b2f97f3cbc7.pdf
    • https://static.s123-cdn-static.com/uploads/4374689/normal_6002e3b2d7c96.pdf
    • https://static.s123-cdn-static.com/uploads/4449178/normal_5fec064dad76a.pdf
    • https://nogeduju.weebly.com/uploads/1/3/1/3/131398368/3613575.pdf
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/4116834.pdf
    • https://cdn-cms.f-static.net/uploads/4367275/normal_6035c05414828.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_off0000e2a9.bin
c6bb61bc8719723ab8ba08b19b20f146d828d7ba9768b09a5911e0770f85486e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 5560 bytes
font_01_sfnt_off0000f59f.bin
3cf1b55754afccaa5fbfddf457f84d3242ff686cd778c5b52363fb8253a7b9e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 12708 bytes