Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7bb1f7ca4bcca8…

MALICIOUS

PDF

78.3 KB Created: 2021-04-05 10:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d47c51acc680fc5968e579885a51d093 SHA-1: ecd0a06a9c4fe3baec0ce627ef170bbaae3d769c SHA-256: ee7bb1f7ca4bcca80965d858749e6cebdb58324303a291151b6a767b97c02528
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to link farms hosted on services like Weebly and S3. The primary URL, 'https://bologen.ru/award?keyword=car+engine+parts+names+with+pictures+pdf', suggests a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution via these linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=car+engine+parts+names+with+pictures+pdf
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/bdceb62f1f.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/punejep_bixuzit_mitabonipevita_sevonetuloj.pdf
    • https://kutobuxuvesoga.weebly.com/uploads/1/3/0/7/130740510/7607684.pdf
    • https://cdn-cms.f-static.net/uploads/4530712/normal_5fe8e4205522d.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_6062ca0cb3d9c.pdf
    • https://mewemevo.weebly.com/uploads/1/3/1/4/131454270/5498592.pdf
    • https://cdn-cms.f-static.net/uploads/4405185/normal_601831b8c418c.pdf
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/5199374.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/937b15bf-4e0c-45e6-843c-29ff73945dcd/14842587114.pdf
    • https://s3.amazonaws.com/zuponefi/turanukaboropebip.pdf
    • https://uploads.strikinglycdn.com/files/e041545e-f38e-4872-8779-e25d273128cc/27272359180.pdf
    • https://s3.amazonaws.com/rogugagatuf/jeguzanowojubukinitoraso.pdf
    • https://uploads.strikinglycdn.com/files/961de410-129f-4b28-9ffc-35d822c4b7ef/is_thunderbolt_3_compatible_with_firewire.pdf
    • https://s3.amazonaws.com/dutimajizowa/47597203576.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/53069253332.pdf
    • https://s3.amazonaws.com/mejobu/sodukizuzobakin.pdf
    • https://s3.amazonaws.com/fodose/nixek.pdf
    • https://s3.amazonaws.com/nitajosasa/how_to_use_standard_normal_z_table.pdf
    • https://uploads.strikinglycdn.com/files/c51119f3-8f4c-42ea-a8ec-12d9b7999411/all_souls_day_catholic_answers.pdf
    • https://s3.amazonaws.com/wizomoravazub/fuzodovuzekujinesigum.pdf
    • https://s3.amazonaws.com/fizup/40123938504.pdf
    • https://s3.amazonaws.com/xomepixo/marine_gps_app_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f440.bin
f65f9a3102d945d9b65925c7f6de584e2606c1dd0b031fa0931767246ca7b1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 5536 bytes
font_01_sfnt_off000106ff.bin
e74b9ed98d95bf26879950c68f3e3e60f93939d9cadfec9f1b79859c6019601d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10812 bytes

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