Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df94ea018eb0567…

MALICIOUS

PDF

95.1 KB Created: 2021-02-19 06:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bf79b32a1edcc7cb4dc30398d31d604c SHA-1: 695e88c11593053d34e362e5313d7003f7552cb0 SHA-256: 1df94ea018eb0567e24620a39ecd488faa70dbe1b2094a3cda5d61c7679ff20e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' and disguised with a search query. The document body, though heavily obfuscated, suggests a lure related to audio devices, which is likely a pretext to drive users to the malicious URL. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=how+to+connect+two+block+rockers+together PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416322/normal_602ce23528820.pdfIn PDF document text
    • http://takefeduw.iblogger.org/lusodijexaru.pdfIn PDF document text
    • https://cdn.sqhk.co/pupumukisev/Sjahdjj/72460173934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fd66dce3c07f.pdfIn PDF document text
    • https://cdn.sqhk.co/tovozovuzedu/1gdhgm8/restore_duplicity_backup_on_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_5fdc0573d0187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fcb30ffba9ca.pdfIn PDF document text
    • http://feboxazatoran.22web.org/algebra_2_transformations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojovosis.rf.gd/define_uniform_crime_report.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/fusamirenunuzebavotujaf.pdfIn PDF document text
    • http://kasamirekajitid.epizy.com/how_to_format_columns_in_word_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/memazutusomuwezi.pdfIn PDF document text
    • http://datidogebe.epizy.com/nufunu.pdfIn PDF document text
    • http://dinilemave.epizy.com/51232108219.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/ventilator_associated_pneumonia_adalah.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_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 5108 bytes
SHA-256: 743159c417ed627400d20f9662846eb2e90edafe32d2cb3900e67733a1609583
font_01_sfnt_off00014a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A94 10788 bytes
SHA-256: a6f90ae33b2427b12c58be0d2a16b2f2bad517f8e4c437183be4dc6166a64852

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