Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e625babe2a8dee…

MALICIOUS

PDF

80.0 KB Created: 2021-05-29 11:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 20f05b20886329beae8c4e84becbf481 SHA-1: 8c5db13bc92c1b717edceadd7be2570947d3ab4c SHA-256: b3e625babe2a8dee3b03dd6f03e57dd0fe137ab054f3ad0504d74241809c17b3
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for free in-game currency, a common social engineering tactic. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', combined with ClamAV detection, strongly indicates malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=how+to+get+170+gems+in+brawl+stars+for+free PDF link annotation
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/96c66.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/7810855.pdfIn PDF document text
    • https://zibesotisudub.weebly.com/uploads/1/3/5/9/135996238/37da5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_60247db063239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_601be2cd7b07b.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/lotanesozefo.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/c24b1f517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_604fc1933177a.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/wufiran.pdfIn PDF document text
    • https://dozajumeguru.weebly.com/uploads/1/3/1/3/131379069/refipagaminedugefida.pdfIn PDF document text
    • https://xorukulimuz.weebly.com/uploads/1/3/4/7/134728044/ganoxobar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369905/normal_600960d209203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6020753217126.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/990436.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff13e5c45aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_603ba710f1fe5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8d10a8f1-8982-4a52-abb0-68e34923a75c/temaditezetit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060c2ae7-71bc-46cc-9f9a-1f6313e56df9/51335400635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47cbf73-40df-4fc4-b71d-a09d96c59afe/169688111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2aa16b-a39d-4fd2-9af9-a84a27398bd3/how_much_does_it_cost_to_service_a_motorbike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7f4add-14af-4da2-b39e-1ed1e7dcc118/rumutorivur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd830fc1-20ff-41ff-abb0-7599ecfc6aef/sesuvufefuviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92709eac-dfdd-437f-9667-a1c5592f2603/staples_professional_series_shredder_wont_turn_off.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 5344 bytes
SHA-256: 6c3a8b094fe35a35aa76c4ca5ae83787b36a585e37b85551e267dc58bab28379
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 10272 bytes
SHA-256: ecedab6e3059b1452fd5be53198534df0234369e511a7a57cbaf58d20b37c9c4
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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