Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a5fe5c77b4b8c3…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 04:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d886bc42eedd56b0942cebcb17217026 SHA-1: 126424552f78265181590ffadacbc1e64f4c2683 SHA-256: f0a5fe5c77b4b8c33f14983224950520e3f9790e27d49bc8657e9a5fff2b5f12
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains references to software upgrades, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=samsung+bd-j5100+software+upgrade
    • https://cdn-cms.f-static.net/uploads/4374963/normal_603b95ca57e73.pdf
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/pigopapugob.pdf
    • https://kazowotamije.weebly.com/uploads/1/3/4/0/134012594/9303885.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_6044d9dccfc47.pdf
    • https://static.s123-cdn-static.com/uploads/4482188/normal_6004cb3093f84.pdf
    • https://cdn-cms.f-static.net/uploads/4450242/normal_6025637b21ef9.pdf
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/4500319.pdf
    • https://fadefufogu.weebly.com/uploads/1/3/5/9/135960472/xizomodijexane-mexomepufisib-dameduxibamu.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fcecfa7b974d.pdf
    • https://cdn-cms.f-static.net/uploads/4366305/normal_602e63a3c2ca8.pdf
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/ae91dbb45737.pdf
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/2c46c0c.pdf
    • https://cdn-cms.f-static.net/uploads/4445531/normal_600ca0475f4ca.pdf
    • https://cdn-cms.f-static.net/uploads/4460983/normal_6023d08d8ba48.pdf
    • https://static.s123-cdn-static.com/uploads/4417527/normal_5ff7d866b41b4.pdf
    • http://bimoriz.getenjoyment.net/nuxoxore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_383be27328404d66ad8c3da00112feac.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_216fd1d6ea524b04a286c5cfb37fee02.pdf?index=true
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_cc8b5d546e014cf784eff8ddf54e331c.pdf?index=true
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_f68854a9001a4378bafa6addad427b1d.pdf?index=true
    • http://forojiwimudobo.atwebpages.com/24245255166.pdf
    • http://miganuvag.myartsonline.com/7842827334.pdf
    • http://nujugeteteda.myartsonline.com/wristech_blood_pressure_monitor.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_5d6f62ce8f124ca4ae1fac67c5328e16.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_off0000fe05.bin
d3c99b0ddd1e43ac59905993077c8bbbd72954e3df44c0cacc944fb543647719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 6088 bytes
font_01_sfnt_off000112cb.bin
3e4d4e49c387530a9d204cbc54223db99665ee9c39c46ddf0d5dd60a4d0fe8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CB 11164 bytes

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