Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0a1d69b67cb455…

MALICIOUS

PDF

66.6 KB Created: 2021-02-16 05:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7843f3b6d32de75a6f8a4138e4049804 SHA-1: f9df293d97a52e8ba3dcaf4db069cd1f14c94b6d SHA-256: ec0a1d69b67cb4552730caa192dc12599bbb6522a3c6c86f27c064ff96691e20
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 multiple embedded URLs, with one prominent URL, 'https://baarspo.ru/strik?utm_term=spanish+descriptive+words+that+start+with+z', being a likely phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute content through disposable hosting. No scripts were extracted, but the overall structure and URL usage point to a phishing or malware distribution campaign.

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=spanish+descriptive+words+that+start+with+z PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419851/normal_600bbb7415de2.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/hfCijig/road_racing_tires_cycling.pdfIn PDF document text
    • http://fevozogu.iblogger.org/htet_answer_key_2019_level_3_sanskrit.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/difrnmo/xetaxuxesagi.pdfIn PDF document text
    • http://takodevizol.iblogger.org/bezatotaw.pdfIn PDF document text
    • http://vukabakoxipus.22web.org/flagstaff_arizona_weather_report.pdfIn PDF document text
    • http://wavarev.22web.org/film_bikeman_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/Tafric3/86741781055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://meganisaniwo.rf.gd/16113053132.pdfIn PDF document text
    • http://jegudorutomowur.epizy.com/codeigniter_3_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/childish_gambino_albums_free.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_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 5436 bytes
SHA-256: f6571bcf97192eea82534b06f8950dd79ef8a372b70c93af913e9464f29f154e
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 15824 bytes
SHA-256: 4e7c2a93508d2bb35ee41a235fa3d0af8c79e1fd4ef2c3abfbc58398455e99b4

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