Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5077957ceb27c1…

MALICIOUS

PDF

73.8 KB Created: 2021-02-23 01:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 29a1281aff9d47bedae5691c8769f7c8 SHA-1: 63df970d2ac14a5fd60445cd67ba477bb2ac8cee SHA-256: dd5077957ceb27c110e5bc6d5759ba779e5dea0b336a2d31cd99ae08f8b0de2e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to "Toro weed eater parts diagram" and metadata from wkhtmltopdf, suggesting a lure. Numerous embedded URLs, including suspicious ones like druttle.ru and igaFnd.org, point to a link farm strategy likely used for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/strik?utm_term=toro+weed+eater+parts+diagram PDF link annotation
    • http://igafnd.org/vabogogaregesifevexibovui1m4.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/idCicMv/riptide_gp2_free_game_download.pdfIn PDF document text
    • https://juvedolukojubis.weebly.com/uploads/1/3/2/6/132682904/3151712.pdfIn PDF document text
    • http://zuvels.xyz/mutuxenozafelav3e1.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/mjcEAgf/56245122674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_5fe948da545e2.pdfIn PDF document text
    • http://pop-marketplace.ru/866280175377epu8.pdfIn PDF document text
    • http://lasleymarkt.ru/75357554216yepov.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/feed_the_monkey_puzzleof6sg.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/xTxhjic/38668492780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fde050ce2f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/icigIKV/xuririgulopuzifudezepivaf.pdfIn PDF document text
    • http://detonic-romania.website/manualidades_navideas_2018_para_nios8rkmq.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/Xgihfjf/sonodavadodezowapisim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_5fedc750a2780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_60339962cf9ea.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/purufiz/wegexukofaluvidoxomamo.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/icloud_desktop_app_all_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/soxojupekulu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/47937558628.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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 5288 bytes
SHA-256: b521b3fd8cc1428e3a527d91807ed0839e5410275cf0f13a71ee426f16e40963
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 10312 bytes
SHA-256: 946bd6cd5b1b3ae045f07b7cb629ebb060c2573a23ca912fa4f6bc13e2e4c70f

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