Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e177894253f3a0b…

MALICIOUS

PDF

70.4 KB Created: 2021-05-18 05:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a59f6adda87814c5a014ccdd62b34937 SHA-1: df5ac568ebe00bc8430bd469d7802c08650bbdbe SHA-256: 2e177894253f3a0b2cf0ecad1fe2ac13161b46c84f3e72f2258e949aebe85fc3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to redirect users to malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

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
  • 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://ponafet.ru/strik?utm_term=letra+y+acordes+gloria+francisco+palazon
    • http://bixapusaxoxuw.iblogger.org/7610983116.pdf
    • http://zefunafujazi.22web.org/lekepasotefali.pdf
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/xazodetebabonu.pdf
    • http://derewopenila.22web.org/23105221568.pdf
    • https://gojazikur.weebly.com/uploads/1/3/5/9/135960276/vejatobojepu.pdf
    • http://sunepoxuvigos.66ghz.com/wumosatimifesa.pdf
    • https://zokaguwozan.weebly.com/uploads/1/3/0/7/130738936/jizuw.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/5577887.pdf
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/1951628.pdf
    • http://dejenenipanoz.22web.org/nudewuterab.pdf
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/pimokibilole_kunup.pdf
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/pebobebikekonowos.pdf
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/24609c94.pdf
    • https://jurusaxigudovof.weebly.com/uploads/1/3/4/3/134341302/3464640.pdf
    • https://tasikedojawepu.weebly.com/uploads/1/3/4/4/134473564/2669793.pdf
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/f2e511cc83.pdf
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/4c77cf10c.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/70a485a2555.pdf
    • http://dumovabitoda.22web.org/nusepomalepunemo.pdf
    • http://zakisakabiran.iblogger.org/what_the_bible_is_all_about.pdf
    • https://tinubabitem.weebly.com/uploads/1/3/4/3/134361694/9514994.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://paxafumalinuber.epizy.com/ravaxafafisiwelaj.pdf
    • http://winovewivigo.rf.gd/50328979366.pdf
    • 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_off0000d409.bin
a3709d45d5bb5e15d60308766260e40e43972d207dc161fdce48c18ed223851c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 5416 bytes
font_01_sfnt_off0000e69e.bin
3a67c44e447426a9dc05b60a9e6b7d6798dca8561d4eb9832fd63b922b75f0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10872 bytes

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