Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc153b80c03cf6…

MALICIOUS

PDF

74.3 KB Created: 2021-04-10 00:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6f8b8a09e0abd03c7762629fd73796c2 SHA-1: b852d964220cd32606d4e59f4fdf6ffc9bad5863 SHA-256: c4dc153b80c03cf67b111c45187cc08d71eb05ceb25544fad3e97e2c4903cce3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The embedded document body text, though heavily obfuscated, contains references to 'mastercam lathe tutorial video' and 'wkhtmltopdf', likely serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=mastercam+lathe+tutorial+video PDF link annotation
    • https://cdn.sqhk.co/remonupode/eUEggih/78702359562.pdfIn PDF document text
    • http://life-news.tech/56114685887hnxrf.pdfIn PDF document text
    • https://cdn.sqhk.co/gojapawareke/hbhbjcy/los_sims_freeplay_mod_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/ifjgIFc/wallpaper_ben_10_cartoon.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/hfjdhdo/ndp_platform_defence.pdfIn PDF document text
    • http://themarkuzmusic.com/mercruiser_5.0_oil_filter_locationc4w2h.pdfIn PDF document text
    • http://getporte.xyz/the_titans_curse_noveli6ezn.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/CgdVhci/povov.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/MIhfoii/craft_store_near_me_open_now.pdfIn PDF document text
    • http://sweetygirl.club/star_trek_discovery_season_4_charactersddov8.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ian5T1S/dipiserulegojomuxixere.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/FhbnJge/towas.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/geiidtt/bujinetufizutu.pdfIn PDF document text
    • https://cdn.sqhk.co/wubejiwixu/xhcgeig/sazirukikumedutidodozukuj.pdfIn PDF document text
    • http://damvglaz0.xyz/computer_basic_coursegkdkc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fac4e10b-bf4f-4ed0-911c-0c6ad49379dd/depogoravafanikudovavu.pdfIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_b47f7f927e284308973febf72f376930.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_2d672a94b17e4f938ee257f297816624.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/audyt_bezpieczestwa_informacji_wzr.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_f02af7ab9f5b4347aceb43b1549771a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/abcd_film_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/baaghi_2_movie_song_video_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/79130519919.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/why_is_my_lg_dryer_not_drying.pdfIn PDF document text
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_c9ea52ca48b54a4b90ff5b0766aa50a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59bdf03-ce29-48fe-ad89-7460fb3838d1/ketasowafijudexijidosa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 5020 bytes
SHA-256: ded26bd1c6474bf059a7b6537658e21eb87f1c2bf603dc97d740b34e856cf711
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10820 bytes
SHA-256: 1f00eee88b3f1286c0cdd52d68bc8225db305fba21a2acc8e7c03d73397cf2cd
font_02_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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