Malicious PDF — malware analysis report

Static analysis result for SHA-256 6017e1898548e249…

MALICIOUS

PDF

78.1 KB Created: 2021-02-25 23:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f2b9428eff9c2598599b7d13ab836944 SHA-1: 98dc2236fb090c078ac44ace2834b3a98547bbd9 SHA-256: 6017e1898548e249aa3daa02e21eb32318de10357d5a5468458ee908981e6f6e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to S3 buckets, which is characteristic of SEO link farms or redirection schemes. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially malicious content or exploit vulnerabilities. The primary attack pattern appears to be using a seemingly innocuous document to host a large number of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/award?keyword=how+to+fix+car+water+pump+leak PDF link annotation
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/3945583.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/3799261.pdfIn PDF document text
    • https://jateredadiwez.weebly.com/uploads/1/3/1/6/131606262/babobanorig.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/0jchfXN/gipiwisisibowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/jarudip.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/kokunime.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/how_to_tie_loop_knot_with_braid.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/duzulutitonegarekevukato.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/kajifujogobul.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/nunokibojulekiwug.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/sanusetike.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/ac_market_apkpure_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/oracle_ilearning_quiz_answers_section_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/bivenuganudanovasoraxoguw.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/48319504082.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/niludosarinadolok.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/ansys_workbench_cfx_tutorial.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_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 5168 bytes
SHA-256: fdb7059a767d20ab7ca430e8e0e0f97c09b9b6413621c1f60c505fddb336d3a8
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10196 bytes
SHA-256: ae7930fb64ee26e2a7b38a4e4eb0b94cb47a31006161008e5d1bdf8f074e2228

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