Malicious PDF — malware analysis report

Static analysis result for SHA-256 efffd037565607bf…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 08:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b3c42a6659a640628047a01ace70594d SHA-1: a67f6f82d42edc888205664a7e57c50545dee3ef SHA-256: efffd037565607bf191f86b37fb37dfe58626456c0fe5d0933160f6a7313f5c6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary malicious URL identified as https://midufefew.ru/strik. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm hosted on disposable infrastructure, suggesting a phishing or scam attempt. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=how+to+approach+colleagues+at+work PDF link annotation
    • http://barcaporirternet-interbank-pe.com/dwarf_fortress_lazy_newb_pack_2021xup3v.pdfIn PDF document text
    • http://wibemixu.22web.org/kindle_cloud_reader_location_linux.pdfIn PDF document text
    • http://sewowenokep.iblogger.org/some_formal_wear_crossword_clue.pdfIn PDF document text
    • http://policyhelpcenter.com/15210157209dmp3o.pdfIn PDF document text
    • http://idealica-italiaofficial.site/monemexopevupov67ie.pdfIn PDF document text
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/solulalosobisokipod.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/3938b71e26c7775.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/9465338.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/24bd5784bdd6a43.pdfIn PDF document text
    • http://nukels.xyz/33540918044auge8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d979f19-c291-420d-b7e5-41197a058f75/85682228650.pdfIn PDF document text
    • http://wafugid.epizy.com/11763559397.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/grammar_exercises_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/batman_vs_superman_desenho.pdfIn PDF document text
    • http://redejepivu.rf.gd/wisoxaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724fe497-cd6e-4dac-8510-118501e7ae02/79580755376.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_1c6e35ab55ad4e469f751706406ce7c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a847f91-5c3e-47ef-b32e-c7213ddaea75/mutexugilaninexuget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/913a817a-ed41-444b-8479-fea0a89f4443/my_zombie_myself_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/79041444870.pdfIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_9ec744598f544c86b6ae9be11f1b8e11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/idaho_falls_soccer_complex.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/the_end_of_dieting.pdfIn PDF document text
    • http://gumajixu.rf.gd/rehras_sahib_path_benefits.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_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 5312 bytes
SHA-256: d91e07ef06693c608023e2820c0b2e19a8162263aeb724f3928a1b5dec293d65
font_01_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 10624 bytes
SHA-256: 777ed90f2cb35d1ca5a20e98ffe39c5b42ed77a8c91639772e42d95fc1baab27

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