Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a479d3e591ee81…

MALICIOUS

PDF

68.6 KB Created: 2021-01-27 18:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ed12c93647056bc8d82ea02fda004337 SHA-1: c045dcfae22336ea8268e4ebe8c967859059c6ce SHA-256: c8a479d3e591ee81ccf8a9830166527f1d8d39c647a45ebfde6818648073b142
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute further malicious content or phish for credentials. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a purported 'Arduino inventor's guide', likely a lure.

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 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://baarspo.ru/aws?utm_term=arduino+inventor%2527+s+guide+pdf PDF link annotation
    • http://timelessdecorum.com/mopavst4l9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500878/normal_600efff51c60a.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/carvel_oreo_ice_cream_cake_near_me2riwu.pdfIn PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/vowulatefimuwat.pdfIn PDF document text
    • https://nokaroropufut.weebly.com/uploads/1/3/1/4/131453144/zowexavefaxaxukituna.pdfIn PDF document text
    • http://triple-doska1.club/milton_maize_maze_2020by565.pdfIn PDF document text
    • http://nutristrike-shop.ru/zombie_apocalypse_2_hacked_unblocked_games_763q8zi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5fcf04b51aff9.pdfIn PDF document text
    • http://rent-nout.site/gorowayx7ko.pdfIn PDF document text
    • http://verifiedbadges-form.com/alien_isolation_artd3t5p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5ff134154bcd6.pdfIn PDF document text
    • http://idealslimitaly-official.site/18001652539ju9qs.pdfIn PDF document text
    • http://nakrutkavk.site/giropexadekokejugowalegxno69.pdfIn PDF document text
    • http://magnitoli-2ekran.site/solar_panel_inverter_wiring_diagram1b812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff8649be299b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374364/normal_5fcd9b2d3f3da.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/6481518.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380530/normal_6007c58e8d97c.pdfIn PDF document text
    • http://rawenspant.online/promo_game_free_fire_playzhp5w.pdfIn PDF document text
    • http://ecoterritory.store/pufezogeses6awm.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5052 bytes
SHA-256: 1662391a61d841f49a92c0917f31474d5186e965472db8c3c51a48e297fc90da
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 10292 bytes
SHA-256: c6ef7c56a6b515d8725c02b37f44be76262ebcc3fd1f28b12302b307ce1edd7e

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