Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c45bd63e15baf…

MALICIOUS

PDF

79.2 KB Created: 2021-05-01 21:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d72679e9b3697e7db1f5effb9b71b24b SHA-1: 3c92558573297386882f61ecf890b668153eff3d SHA-256: 793c45bd63e15baf8998343fa12aed9fdb8e46ece8ee778b85bb35e353d7cc7f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, likely intended to redirect users to malicious content or phishing sites. The document body, though corrupted, suggests a lure related to fixing treadmills, combined with wkhtmltopdf metadata, indicating a potential phishing or scam attempt.

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://bologen.ru/strik?utm_term=how+to+fix+a+treadmill+that+won%2527t+start PDF link annotation
    • http://lnstagramverificationbadge.com/27730549472iod6r.pdfIn PDF document text
    • http://gnoogle.site/74916671046kg28n.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jcSqbTr/32623418581.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/jsgcgdm/discount_formal_dresses_brisbane.pdfIn PDF document text
    • http://samyog.ru/supplementary_and_complementary_angles_worksheetqd3n0.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/gfjhRjd/31484826864.pdfIn PDF document text
    • http://storeplus.pro/wofuwoziwudopgbaso.pdfIn PDF document text
    • http://tekplafond.xyz/when_god_winks_at_you_barnes_and_noblenoxc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_64e60fc62a6644d9a4a2fb4a80db6bc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f7889d-483b-4a4d-808f-9bb72a8b3d69/94731651279.pdfIn PDF document text
    • http://kizuwopo.epizy.com/bumblebee_song_piano_sheet_music.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_4793d514b85845eb92fee16447a62a32.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_99b10eef88df4787a2f6c377853c1109.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_b2615a5d894b48aa9de52dfa56c2a883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/68339770318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88054d83-12cc-45d3-b1d7-509d9e25cc2e/tuxojegoged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093776ee-6234-4af9-8093-ea982eea3538/catching_fire_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae162c8-8410-4a7f-9a66-fb5481d6992b/what_are_the_objectives_of_security_and_privacy.pdfIn PDF document text
    • http://livugaxoretedop.epizy.com/jazz_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/62407675011.pdfIn PDF document text
    • http://tofufelu.epizy.com/rixifupavuwalejipazulun.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_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 5300 bytes
SHA-256: 6c70353beaf7e5308f58b28f6f789283ca85d80c02513691f4c34ac5f253188a
font_01_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10956 bytes
SHA-256: 72b15b0fbb81d64f54d6775b21a452612b215ca8191ef8ae7794c4903062d873

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