Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be186b5970ac04e…

MALICIOUS

PDF

93.5 KB Created: 2021-01-11 09:17:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f29630f291664ac3a22594a7df4386da SHA-1: d0351ca9848fb88e07b582e0edd09d2b92aa7b83 SHA-256: 6be186b5970ac04e20eb679ded147e107681afddbf79ff77ac771e8f4b683d01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of numerous Weebly and sqhk.co hosted PDFs suggests a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://trafftec.ru/aws?utm_term=bmat+2015+section+1+explained+answers PDF link annotation
    • https://tufakuxumiwe.weebly.com/uploads/1/3/1/4/131454237/5710559.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/egegihg/condado_tacos_mason.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/hcNiija/69761104385.pdfIn PDF document text
    • https://cdn.sqhk.co/badisasi/2hgZiig/upsc_nda_exam_date_2020_sarkari_result.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/bidava.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/pekibuf_wimefexaxepojo_pegez.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/gfhhick/59006066722.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/rucjdjf/knives_crash_game_vui.pdfIn PDF document text
    • https://padomixuboji.weebly.com/uploads/1/3/4/5/134527159/978095468e.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/5Eyhgia/kezabizisidelek.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/M7javgf/23115338189.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jdSHij6/baby_yoda_eb_games.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/bgiLfjb/34537431602.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/gijukorepigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 5880 bytes
SHA-256: a6b5cde58825a4ac974d95d1a6306f3edfc7c7169c11eb12a29f42de471a67e5
font_02_sfnt_off00012c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C68 11120 bytes
SHA-256: 56ea00573a60829b7334ee36f7c143b8b7f0185ea9ff9f69a25ee3834a4ba734
font_03_sfnt_off000152c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C7 16152 bytes
SHA-256: adb4674434390813b481ca077012106496299401195bc4babefc956c6f22bf1b

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