Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31c1eb7603d7dff…

MALICIOUS

PDF

79.8 KB Created: 2021-06-02 08:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0cc6f7b61348049909f8b8777686dd66 SHA-1: 044f8961560cd6f63e44c75a81c0ae830f42f932 SHA-256: a31c1eb7603d7dff85d59c39314a003ab59e3c78704a509a9d7281040fa3dfaf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://queure.ru/pbw?utm_term=mrcrayfish%2527s+furniture+mod+crafting PDF link annotation
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/vuwojara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_604ce46ed1379.pdfIn PDF document text
    • https://nirotagikul.weebly.com/uploads/1/3/5/9/135992947/badusiremo.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/c17b5c93d35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_604d8a309b44f.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/1384868.pdfIn PDF document text
    • https://pusoguxararafog.weebly.com/uploads/1/3/4/5/134593470/b75bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_6027965da401e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6013e2b620012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_6031dc9a9b09c.pdfIn PDF document text
    • https://vifapuxup.weebly.com/uploads/1/3/4/0/134018045/lijomakosidaniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60269030431d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_6017470a83ca4.pdfIn PDF document text
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/sakobulopito-nisakiru-guvitubigodoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144492507/9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704e2446-63c9-46a5-91ba-39403e947c37/what_does_ke_mean_in_chinese.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415185/solving_compound_and_absolute_value_inequalities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db75e7c6-34ed-4eee-b516-544a84b4d2d3/sorugoxogagad.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/what_is_the_next_power_rangers_series_after_dino_fury.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144495654/why_isnt_my_fios_remote_working.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144440556/modern_auditing_and_assurance_services_5th_edition_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009e6201-860f-4db7-a9f9-dc2cf2a64913/how_is_a_babys_gender_determined_at_conception.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 5544 bytes
SHA-256: 9e4b4ba66730522783a288317e4920654af0cd7812e94a642d3c8a5544ea8347
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 12396 bytes
SHA-256: a126b77b016d17e9728f4263d8fadb8a51506af32c79b19fc98600e582cbe62f
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 16064 bytes
SHA-256: 9b78b915eb75ef0aea6965a6113565ca1bcac7735c766488ce9f12ff332a71b4

Open this report in the interactive analyzer, or submit your own file for analysis.