Malicious PDF — malware analysis report

Static analysis result for SHA-256 0562e1c5ceb07f28…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 07:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f8f0004b87e4ab0c4af4091f6da8e543 SHA-1: 4cf93a78b42086436626313e3292742cafe09ce6 SHA-256: 0562e1c5ceb07f281a4739f8e402370ea5877b66327602b4bf6d7aa250ba7e55
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, with heuristics indicating a link farm designed to manipulate search engine results or direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=types+of+incentive+plans+pdf PDF link annotation
    • http://albl.ru/xerox_workcentre_3325_user_guidegyxfn.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/HjhFigH/wolo_air_horns_for_motorcycles.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/cjHOdjd/luwugorifuwumozutolis.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/nicJXjh/varevajavetom.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/6ihxgh1/92902227337.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/WWVaJhj/rigoxodebe.pdfIn PDF document text
    • http://shopwithsale.website/how_much_compression_should_a_briggs_and_stratton_engine_have7il7k.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/eJIhaEz/reversi_othello_online.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ghrLggf/tazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/divexikav/bikituk.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_f154ccf917ed434095b703e14dd9afe8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bookman_ssi_font_free.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_666552bbc3ce4c4da936a39cbe0d9c22.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/33687595993.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_6b9a23c902fa46ab9a738399791f2ffc.pdf?index=trueIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_782e70ee309940968fb38a6514ac94b9.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_c7a054a65f70491ca2924ed58c2cca37.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_e824fc79001e4ac898f2ef133e2edab4.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_0ce2a6a663b54a7180b6f514dab9684f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/redorudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 4952 bytes
SHA-256: e4ebe3f76f2e36044decb236d91f41e65f4624d6424f08a659c39a19b806d910
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 11052 bytes
SHA-256: 93056bd11a0c13471511a4c30810caad17458a6e2da1562201ed77e01ef5d833
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361