Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59148c1f55d0c8a…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 18:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a653d275aed39c5472cd8cc1c4ceb3b5 SHA-1: 67ffbba71266de4e3b169cab3fb70b0b43e3b582 SHA-256: b59148c1f55d0c8ac1a66cf661824e0b685891eb869ec192979cd77e04ae3276
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, suggesting a tactic to manipulate search engine rankings or distribute further malicious content. The presence of multiple disposable hosting domains and UTM parameters in the URLs further supports a malicious or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=certificato+anamnestico+medico+di+base+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382772/normal_603d4219cafbd.pdfIn PDF document text
    • http://hq-cleartv.info/vigipupirowkhajp.pdfIn PDF document text
    • http://wildboost.club/faladadumomewijarabokosqni2j.pdfIn PDF document text
    • http://apsdd54gfv.xyz/dwg_viewer_online_autodeska5hl1.pdfIn PDF document text
    • https://cdn.sqhk.co/xidizizo/dickJhc/gaxanifogenuviwikena.pdfIn PDF document text
    • http://kdghy.online/28333332220zjvco.pdfIn PDF document text
    • http://shoes-storie.club/acting_first_six_lessonscoslo.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/d7hovhh/17591527493.pdfIn PDF document text
    • http://aduo5.online/21843967500oyzjv.pdfIn PDF document text
    • https://cdn.sqhk.co/dikarulik/haOOhdq/3726081079.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/eufiihd/vojugaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600aaa1f723a7.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/its_kind_of_a_funny_story_trailer_subtitulado67x5k.pdfIn PDF document text
    • http://kzrovk.xyz/32001348703lk5m5.pdfIn PDF document text
    • http://myimperfectmomlife.com/20192870600f8erm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_9d3c80e4d4174133833e658604b3f2c5.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_76989d2d26fb4eefb8da8c690c8151a9.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_e7acc27aab134fbf9d30ea27528ce502.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_30353c1b1ff6432d81503ef4cd3bbc61.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_168e153e10554f08b0d67c34f46aa052.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_9e24b6319c1842b9a999288e8517f40c.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_f482a4cafcbf4cdeb0136a2111953335.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_9547991a7cba45e4ae1e62b503f418ef.pdf?index=trueIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_9b704c01ea4742b0b36bd4f2a2ca70e8.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_33549a8158df414db102d969d22cd97f.pdf?index=trueIn 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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 5316 bytes
SHA-256: b57a816087b3ab834d2c0adc9d1bfc27921b27b2c75c187a7350e2997f8b9055
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11756 bytes
SHA-256: 563b55dae5078faeba63271ccf9360a9b5e929eb17ce197acec7ff3a4886f4e2

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