Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f7340a3da23b9b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-16 10:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e0cdeaca72eb7ea76ee0e72c30467c96 SHA-1: e918e71fc5bed5b4f64111a60be74fefc2d701ad SHA-256: 79f7340a3da23b9bd7e5b0ffdd3a6f7ecbb49b35064aa8796ebc31fee5ecb50e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=fanuc+robot+programming+classes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460063/normal_604e6ca4aed14.pdfIn PDF document text
    • http://potoborotagivud.22web.org/helge_ingstad_aibn_final_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_6035d553ac425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcecf815666c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ff031d3b8553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_606150e7055a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6022f552a0702.pdfIn PDF document text
    • http://pufemebulod.22web.org/tezeviruliwuterepisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ffb30ec63f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5fd31b6205304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigobawavelig.epizy.com/incursion_guide_poe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14217c4a-2e91-4d32-995e-09cef3404f34/josugikinel.pdfIn PDF document text
    • http://wifapig.epizy.com/wotaxurudipadixa.pdfIn PDF document text
    • http://wulimazef.epizy.com/21537491379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4baaf2-ea53-4b80-8af6-e119519eb49b/34387610850.pdfIn PDF document text
    • http://kiwozoma.epizy.com/vonanomususemoxir.pdfIn PDF document text
    • http://telijekiw.epizy.com/gatodomaxiluresoneguliko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fa4ddb-52f0-4a29-b510-267e9288b2c4/that_time_i_got_reincarnated_as_a_slime_light_novel_volume_9_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01412885-2792-4758-ad4c-a9ea9fea27db/the_burning_maze.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5348 bytes
SHA-256: 29169e41828a49b0c0224f6653aec5fc10740cdd7250ad60051faf3fc8093e92
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 10596 bytes
SHA-256: b7ed4919b7be69507b36ca17538b20b5f4f5f409e23472ff028b43adc3aa73a3

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