Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ea75abc9512ed6…

MALICIOUS

PDF

75.7 KB Created: 2021-03-31 20:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 031e00776f7f666db94e1bab12dc0b53 SHA-1: 77725aa95eec0b6aa593183a17b31b7fa9f243c4 SHA-256: c0ea75abc9512ed6587b56b4db17346c9efc9d69fb4f34f27ade2ce817907ae0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link leading to 'baarspo.ru', disguised as a search result for 'gmail sign out of one account'. The presence of a large number of PDF links suggests a link farm or SEO poisoning attempt, likely to distribute further malicious content or phish for credentials. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://baarspo.ru/wix?keyword=gmail+sign+out+of+one+account
    • https://cdn.sqhk.co/gofejenizew/icIhj7F/roxajek.pdf
    • https://cdn-cms.f-static.net/uploads/4460981/normal_605e0f108a589.pdf
    • https://cdn.sqhk.co/liguvikozo/hanshdi/delta_band_saw_parts_manual.pdf
    • https://cdn.sqhk.co/fugovigul/jc2xhef/hong_kong_coronavirus_today_scmp.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/560614.pdf
    • https://cdn.sqhk.co/towafeniruje/jjxfc5J/get_more_likes_on_instagram_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4449405/normal_6051ec3f0fefc.pdf
    • https://cdn-cms.f-static.net/uploads/4495858/normal_60270f2b2768e.pdf
    • https://cdn.sqhk.co/xebosulog/5zqYPFu/67371474089.pdf
    • https://cdn-cms.f-static.net/uploads/4401505/normal_601dff432c65e.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd17d64075a9.pdf
    • https://cdn.sqhk.co/zumedizojas/lgiMfqs/43907283619.pdf
    • https://cdn.sqhk.co/kususarefeja/fbjieJD/chahu_pass_pass_aana_ringtone_free.pdf
    • https://berijuwijupev.weebly.com/uploads/1/3/1/6/131637896/nodewonememe.pdf
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fd178bdc3b38.pdf
    • https://cdn.sqhk.co/disidudi/hgjKfg4/gundam_wing_heero_yuy_quotes.pdf
    • https://cdn-cms.f-static.net/uploads/4424024/normal_601a6416e473a.pdf
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/3545972.pdf
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/b6c8d2.pdf
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/giledasel.pdf
    • https://cdn.sqhk.co/mixasuwekov/f8gjjbW/best_woodworking_gifts_to_make.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/595ff440-ca19-4e03-8120-f7559661f1f5/simple_recipes_for_fussy_eaters.pdf
    • https://uploads.strikinglycdn.com/files/e388b9bd-e49b-4cbd-8d2d-470051965042/lanekalawado.pdf
    • https://uploads.strikinglycdn.com/files/6d94a8e9-f376-43be-b42e-657d652681cd/fosidatomiretefapopefujuw.pdf
    • https://uploads.strikinglycdn.com/files/3e12418e-bd25-4f9b-88e1-14966056ca18/how_long_should_a_toro_snowblower_last.pdf
    • https://uploads.strikinglycdn.com/files/e5fb8b2f-8707-4546-9216-bfa8791b0096/gujemanupawavuboro.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_off0000eb2e.bin
bd89f79d7f7130f0af937de4da26ae08f62b40bad0672975a7760d6d84426914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 5136 bytes
font_01_sfnt_off0000fc9d.bin
78df121938e424e44e4b6404ee1d0052fe77d0840b4038e35d33ca4d325ffea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 10848 bytes

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