Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a242d36935c844…

MALICIOUS

PDF

71.1 KB Created: 2021-03-05 22:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 499a08f26a689f4b65258178c30bcc03 SHA-1: 858897a065f65dd4f937e543bb97ff54d20757f2 SHA-256: 44a242d36935c844e7693d3f948729ee50849b748901a73a37e5353be1931d54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The primary URL, 'https://mezovuduw.ru/strik?utm_term=how+to+charge+your+jlab+wireless+earbuds', is presented as information about charging earbuds but likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=how+to+charge+your+jlab+wireless+earbuds PDF link annotation
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/08e6f.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/rugebowukuxevize.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fc898766ff32.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/nivopu-sekuget-zakefujanezil.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/7253263.pdfIn PDF document text
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/4426270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff67ec80dda3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fca4c8fd88d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5fc5c90e2bfa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6028571fd05c0.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/d9abc74cc494f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372982/normal_603a8a9a7bb79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fc6745e330b2.pdfIn PDF document text
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/fuxozivenelotidegade.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/eab2af58e1.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/f6b46409-a418-4a2f-b285-f9b3c693656a/how_much_does_a_medical_lab_tech_make_in_alberta.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/46699448066.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/sonesaxapotifap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6ce8c7-5d19-4d96-8b6e-4c97a77baffb/pawexajov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d336e19d-d0fe-4d8d-a658-c3c61ca272f1/ladifelivefidelivedoruxub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf7452b-3696-46e5-a3b6-370593b4f187/vukevitijikaxozeda.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/gmat_sample_questions_and_answers.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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 5572 bytes
SHA-256: 6f480524998d0ac4317cb9552b20f9cb21958c8e683f022b6e14fd16aaf5ea96
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 11432 bytes
SHA-256: 2fe84ff2969b1057299ee4579c5affe3c1430a241544a602384ddfe32992a0ef