Malicious PDF — malware analysis report

Static analysis result for SHA-256 b660f04f4364255b…

MALICIOUS

PDF

67.3 KB Created: 2021-02-27 21:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a2130a5b416665b4146bde821a4539b4 SHA-1: bffa96f496cf9f4f13e175b1fd50deaaafa6025d SHA-256: b660f04f4364255b49dc1bd704056577dbec7d620a45e11e13b80f42453e1023
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be related to workout routines, serving as a lure to direct users to malicious URLs like https://gimoguvi.ru/wb?keyword=c-mass%20workout%20routine.

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://gimoguvi.ru/wb?keyword=c-mass%20workout%20routine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467030/normal_5fe5f257f0eb9.pdfIn PDF document text
    • https://nanuleseja.weebly.com/uploads/1/3/4/0/134012971/losevemik-fifukeniri-zajokej.pdfIn PDF document text
    • https://xarugowa.weebly.com/uploads/1/3/4/7/134733051/7001409.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/N7F9giC/32007977684.pdfIn PDF document text
    • https://fixogamirumi.weebly.com/uploads/1/3/4/7/134715439/42680062.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ehg3Wgd/kuxazenoveriwosuguzagivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_6021241a3777f.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/hiihghc/gagevumel.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/vonomotamikimaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5feb722f20341.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/mudujibaguvo_jexivuporisire_gafufine_tilupodad.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
    • http://ponusiniwanus.epizy.com/zinepasarelawuzexodebixin.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/61973327956.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/wodugim.pdfIn PDF document text
    • http://bunenivep.rf.gd/panasonic_phone_answering_machine_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/mikitavonugotivetejidiwi.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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 4892 bytes
SHA-256: 60476f5d6497f397e92708d6e85ad8eef5e4cbba053e322c9ef10dd12422ee48
font_01_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 10360 bytes
SHA-256: 917fcfcbbdf8c82c51e31fcc568ef08f89e8fb26b604fcae548da046c6fde818
font_02_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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