Malicious PDF — malware analysis report

Static analysis result for SHA-256 654fcecf8fafdd73…

MALICIOUS

PDF

178.8 KB Created: 2021-04-03 15:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 732286d192cddeb2e0aa53ebcd6d9a39 SHA-1: 8a2a07e8332e3014e096ae04303f6699e7d40ab0 SHA-256: 654fcecf8fafdd73e4da39c0e30d261f01b41bb0be9acc877d1d856f09a8926a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://golowaki.ru/award?keyword=aggregate+nutrient+density+index+pdf PDF link annotation
    • http://veselutut.mywebcommunity.org/65325827281.pdfIn PDF document text
    • http://sibefumunefeke.iblogger.org/buzulumitadevojamugawu.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/boolean_expression_examples.pdfIn PDF document text
    • https://zobovakobazazu.weebly.com/uploads/1/3/4/3/134319401/c91701ac2a.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/suxezilukumukogiwozobivaw.pdfIn PDF document text
    • https://menudapopejit.weebly.com/uploads/1/3/0/7/130775932/rulifi-zanifo-ritafe.pdfIn PDF document text
    • http://rilawaripulopix.iblogger.org/68310288117.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/2150285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekezixurul.onlinewebshop.net/powerscore_logic_games_bible.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_cd1f169d159e47e5a04b60cc872167c4.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_ae1b43c874074f01bada3c80e9e479fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c749c0-672d-4620-a7f9-4908eb1f1e20/xopalaxiruro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0ae1ac-1744-44ac-9e2d-ef410c3e3ea0/38495062912.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_ed8b4c93e2fc4d298c17e7ca43f89e6b.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_470ed48c59bc4e15829045624e88e8e1.pdf?index=trueIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_9ce743c3f57b4a848d184341a192b40d.pdf?index=trueIn PDF document text
    • http://zudovub.epizy.com/negutiwiwelepafezuvogi.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_06722d8dc47342d6b863a00854be7795.pdf?index=trueIn 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_off000282a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282A4 5336 bytes
SHA-256: 195c945cd7277bb026128494ed897357d6d17c68efc483485cb845f4f6325a77
font_01_sfnt_off000294ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x294EA 11864 bytes
SHA-256: 0293cf19bddc8f500f36289b874ac9587bb3c2debadf36716163a55c7087eaf6

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