Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63c12366484f2c2…

MALICIOUS

PDF

73.4 KB Created: 2021-03-18 07:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6fa1d8223281202ec6887b7fb16d92d0 SHA-1: f5cba7bbd4b1215d0dd19563561b9371e8321d50 SHA-256: a63c12366484f2c2b7a16de3d49f7794b33e63ea9c6d627e14d0b2a6d685ab7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a malicious intent to redirect users to potentially harmful content.

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://jacksth.ru/fweb?keyword=atwood+machine+lab+answers+gizmo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470232/normal_604a167abcaef.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/hfieAij/wisovufokapasaba.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/gjgjoPd/patching_screw_holes_in_plaster_walls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499942/normal_5fcb2f528d269.pdfIn PDF document text
    • http://uk-delfin.ru/how_to_put_rosetta_stone_on_iphoneysq17.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/hV7hfjd/tudiwirikuxenonurel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5ff09a1cb46e3.pdfIn PDF document text
    • http://sozutopilezo.iblogger.org/lijadim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_600a8f7913e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_6037301466288.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/IrcuhgU/bavipeboloxadupa.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • http://apparentlyopt.com/affliction_warlock_3._3._5_pvp_guide8u5ch.pdfIn PDF document text
    • http://itash.space/10372936415lo604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383566/normal_5fecc39715d8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusepubenawipad.rf.gd/53900829875.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/madewolekovojonojanekim.pdfIn PDF document text
    • http://bupomejov.epizy.com/dilofuxufobezuronizeri.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/laminating_sheets_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/21354570385.pdfIn PDF document text
    • http://pareruwawetis.rf.gd/potoponenirazixelij.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 5624 bytes
SHA-256: 1546ca41c134ed4aea803540963dd160887c1687f8df1375ab9f3201fe0c6799
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10696 bytes
SHA-256: 455678470c4df6d403c69fd9714e9d1cb8d10193b5c0482e66bd8237f8054944

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