Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e098833918800d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 10:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5692b6a8be3854eb0283f1ef834544d0 SHA-1: 43c53cf694fc3417e92d3ae816a1ec4218073371 SHA-256: e7e098833918800d3b748b1586a0dec8947c637a8b7ac7fabeb859f79f642af2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=java+pdf+viewer+open+source PDF link annotation
    • http://fxlcd.com/upload/file/22741448412.pdfIn PDF document text
    • https://kawanmto.info/contents/files/juwagojuwanitiki.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zewoze.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/mekonodowep.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/susepidetilin.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/52904489842.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/telos.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/44467792572.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/27653031913.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/37089147734.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/zekobonokejokovasewafupe.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/katorolev.pdfIn PDF document text
    • http://sivam.pl/files/file/tobevunuwuvude.pdfIn PDF document text
    • https://masihpt1.com/contents/files/metoresupotopom.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/rusebevixup.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gedezuku.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/15594091805.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/577f750d009f992de68a5741c78a2858/57447522705.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/55176458204.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109180625342571.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC9 10712 bytes
SHA-256: 679a5ba2edd6a583c5bd5de3de78797f2aa93f6ace31898e85fe98aa09f51483
font_01_sfnt_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 16872 bytes
SHA-256: 1ef202b1ab88352a45aeda2719a4da21f3dc5fe8044c48ce86be1ee844d2fb8d
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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