Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e25b1e5f8dd12…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 03:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f10a94c5bab5902afb3b6b7abafeb08 SHA-1: 29790d39e74b0416b1638731244ac238ec794365 SHA-256: 927e25b1e5f8dd1208988161c4145411d2cb35fd6116ca78979f772d518c6119
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=edward+rutherfurd+books+ranked PDF link annotation
    • http://vinnipoh.space/84541143488zs3y7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374185/normal_602034db7e1f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_6005bd8504473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff6637c9a24f.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/MggphkI/94648587921.pdfIn PDF document text
    • http://pannochki-art.com/disney_cruise_lines_openingpy90p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd340ee19675.pdfIn PDF document text
    • http://gasorutika.iblogger.org/81173768052.pdfIn PDF document text
    • http://getchambre.xyz/57329766503vf7zi.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/hgigjha/death_coming_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/ieE3heU/gb_whatsapp_auto_reply_apk.pdfIn PDF document text
    • http://unosital.space/namita_agarwal_odia_bhajan_songyt94o.pdfIn PDF document text
    • http://com-copyrighit.com/how_to_open_seagate_external_hard_drive_xboxqbaj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_605358fd446ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_654f4caa28534892b19ff63d3ae403ef.pdf?index=trueIn PDF document text
    • http://zovagesilamijuj.epizy.com/55334752922.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_92437a4013984737a26f485b54efcf4b.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_13798f46dda744e4acdf3fdbc1191b5b.pdf?index=trueIn PDF document text
    • https://9c33b4df-6f14-41ad-9e94-a3a23f7ed20d.filesusr.com/ugd/2a975f_51239b5d45ee4a2dac9d1cf9be936862.pdf?index=trueIn PDF document text
    • http://nadilafirot.rf.gd/mefejagemufedas.pdfIn PDF document text
    • http://mosiwejajawam.rf.gd/most_important_synonyms_and_antonyms_for_ssc_cgl.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_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 5216 bytes
SHA-256: d52e2b6d0b4d5bbbfd79f6bf88d2813ddba69d1e608883f443ef0d7799f22b04
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10940 bytes
SHA-256: d8a8e172db2a55c2a919b969f560e532fbcb11673f36f1effd3d6b8778e826e0

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