Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deb145aa231aa29…

MALICIOUS

PDF

81.1 KB Created: 2021-02-18 04:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ec856f178cb7fd92c413c4c0cf33f01 SHA-1: eb7b87c95ec907b8dd95b8bd18fdc748af59b909 SHA-256: 8deb145aa231aa29436dc90eeb852a81f7d28575a5905c2787228c2a652910d7
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 a primary suspicious URL pointing to 'baarspo.ru'. The document body, though heavily obfuscated, suggests a lure related to 'short circuit current' calculations, likely to trick users into visiting the malicious domain. No scripts were extracted, but the presence of multiple external links indicates a phishing or malware distribution attempt.

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=how+to+calculate+the+short+circuit+current PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475391/normal_60222f267765e.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/jipuwe_fomisomelotot_fovosegawat_giwobaxizi.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/1f5799d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465557/normal_5ffe45d0c05e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_6000e53dc25b1.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/49127689010xd3tk.pdfIn PDF document text
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/8747482.pdfIn PDF document text
    • https://jesugenug.weebly.com/uploads/1/3/1/4/131406432/rejadufekunisaf.pdfIn PDF document text
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/kixawibejoki-mixegowigibujim-jomiri-xajitivusal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadudadu.rf.gd/fewotet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/nekutuxopunenupupikebi.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/dancing_queen_sheet_music_flute.pdfIn PDF document text
    • http://rirazito.epizy.com/54265743584.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/nuvaga.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/51042967172.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/zafamejeku.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/jobesumabimonowiwamike.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 4940 bytes
SHA-256: fcc0a5721b34eeccd7c02c9c1ef37bd4d2ba543d85ce707a43bff0261527c270
font_01_sfnt_off000111f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 10832 bytes
SHA-256: c9c3fa214d7fdf925424d897a03df185972534f744f49a3cf0ff85c03fafeddc

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