Malicious PDF — malware analysis report

Static analysis result for SHA-256 98576b9b948f637a…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 04:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0521d4a6a3d1741399204457a777d84b SHA-1: 60c01c84f6de97422078325cbda0bc847881766f SHA-256: 98576b9b948f637a5d0b9b4b87b1cdfc2c3cc77551de1f1fcb5d61fe7ca274ce
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=yoga%20poses%20for%202%20beginners PDF link annotation
    • http://shoop-fl.ru/button_battery_chartsfmdt.pdfIn PDF document text
    • http://wirelessinfo.ru/52756052625otbbs.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/10d93258c7b69a.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/1bb46fc297.pdfIn PDF document text
    • http://optarfes.com/46735003992dn3t1.pdfIn PDF document text
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/wazafolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwigivexuvobe.epizy.com/jupek.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/kgf_amma_images.pdfIn PDF document text
    • http://lipunigofajeza.epizy.com/bedorexegopudebuwisos.pdfIn PDF document text
    • http://virixavop.epizy.com/16308946784.pdfIn PDF document text
    • http://gawusozuf.epizy.com/linizimidif.pdfIn PDF document text
    • http://tosuniwenalob.epizy.com/what_function_does_the_left_side_of_the_brain_do.pdfIn PDF document text
    • http://difuxifomag.rf.gd/173636924.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/lemakozumodiki.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/how_does_a_hydrogen_internal_combustion_engine_work.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_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 5272 bytes
SHA-256: e10ce00e74a52f9c4b3678ffd43b5393aebd461f5200633c69038ceec6217bc8
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 10564 bytes
SHA-256: cfc756c67acec92574d88cf6fb4a72dab14259d347e9611059749d7320793af6

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