Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc042fcb78de63f…

MALICIOUS

PDF

78.8 KB Created: 2021-05-18 06:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4887bfd5af439854da46ea957e086b2b SHA-1: 995f5b163973d12bbeb38fa3212f9997c9a1f413 SHA-256: 6bc042fcb78de63fc7070a1d30e93290be0df6890ae5d24e3a4ce1c7c4a5ec2d
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' which is likely part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, suggests a theme of sending holiday greetings to clients, a common lure for social engineering attacks.

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/strik?utm_term=carta+para+desear+feliz+navidad+a+clientes PDF link annotation
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/6146944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_606a247e23e74.pdfIn PDF document text
    • https://malugeko.weebly.com/uploads/1/3/1/6/131636988/fesepuzowixaju_fuzowotuxilasuj_rirenuverexeta_zipif.pdfIn PDF document text
    • http://fimozagori.iblogger.org/bezamawonosub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5fe7011725029.pdfIn PDF document text
    • http://wokokijup.iblogger.org/safaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_60558beed8cff.pdfIn PDF document text
    • https://bebilakag.weebly.com/uploads/1/3/0/7/130776425/1530257.pdfIn PDF document text
    • http://robekap.22web.org/thor_son_of_odin_marvel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_60095fbae2f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fd63b6d92d66.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/68f3ffb3-6230-458e-af71-7eb17e621f38/how_much_is_one_krispy_kreme_donut.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/45898705276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c13aac-7ef3-4387-9445-273ee2210cb4/adding_and_subtracting_mixed_numbers_word_problems_worksheet.pdfIn PDF document text
    • http://likalesiwala.epizy.com/defuxuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/zarivajugejexalelara.pdfIn PDF document text
    • http://nifukugobu.rf.gd/66959309363.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_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 5164 bytes
SHA-256: 892056f34d65244147af103c65d4e0742149412ee90f3c1b0b96a0c544332116
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 12460 bytes
SHA-256: ffc040cb28ab0cc31bc90e85d2691ebc31d2640da89f0db91b7df15aba27fdf5

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