Malicious PDF — malware analysis report

Static analysis result for SHA-256 4812a66f0fb98a0f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 00:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 93480c3a0e30130011ff564c13850154 SHA-1: 72314cbcba6f7307f4764907d58316fcab96adf8 SHA-256: 4812a66f0fb98a0fe8e7694432f85eafc0648097b93960c01fe56af83669c8f1
266 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains numerous external links, including one to 'gimoguvi.ru', which is likely part of a phishing or link farm operation. Heuristics indicate a fake CAPTCHA and MFA lure, suggesting the document aims to trick users into providing credentials or approving authentication requests. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gimoguvi.ru/strik?utm_term=how+do+i+change+my+wifi+password+with+centurylink PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369516/normal_5fe3afaa2bfed.pdfIn PDF document text
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/6523068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_603ce1a9632eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_601e0b8b4a588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6032029938ca8.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/5200295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_602b45139f395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_d897dfafbf4b440f98b59115d2ec2800.pdf?index=trueIn PDF document text
    • http://sanupivoxenano.epizy.com/best_math_workbooks_for_2nd_graders.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/beats_solo_3_wireless_black_friday_deals.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/87230209732.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_ade07ee99bc94b7b944649326063a473.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2c4ca2-2a66-43c2-a656-433d9adea795/precalculus_enhanced_with_graphing_utilities_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5f80bc-904f-4858-8df3-a2ccf1086ae9/10460152839.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_32c1b26b9a604ae6bb2f50ee85239ebb.pdf?index=trueIn PDF document text
    • http://mevalegija.rf.gd/1st_and_2nd_law_of_thermodynamics.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_3f80fc8406d648f298412ddff818ec9e.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_22d997f3086f47e399f0c050cf7ac4ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16dad6c-1463-41ed-9da3-91749d57f1c3/wogolatubuxowezewidufov.pdfIn 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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5788 bytes
SHA-256: 007dbd1a3e6841d65f8bdc3ad67f5c2ad89c6b7762f20797da1d930e4318b546
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10676 bytes
SHA-256: 83fd87e0cb8110c40a3f205eb6d2115f70a2c2fd8ad9d0050389ce1adb57af99

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