Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c6a0cc4a855138…

MALICIOUS

PDF

105.6 KB Created: 2021-03-25 23:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089f442a646e6e1f99041b1cd4346ad9 SHA-1: a514a8590dac55026a3b0bdd7e2b6c3e2ae13636 SHA-256: 82c6a0cc4a85513811b5cecbbf75178137b5a00ab0c1787cbae3005203e42ab9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=dracula+bram+stoker+film+wikipedia
    • http://marafonsport.site/924259176241c0b.pdf
    • http://zitupow.medianewsonline.com/learn_python.pdf
    • https://cdn-cms.f-static.net/uploads/4499317/normal_6034355c7e38d.pdf
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/8cdbd16ebe065e.pdf
    • http://remastacer.com/86489252228oz3yz.pdf
    • http://bighome.space/which_programming_language_is_easy_to_learn_for_beginnersgm5nm.pdf
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fdd9dbec3f7d.pdf
    • http://dedigevobunobe.medianewsonline.com/xegazav.pdf
    • http://carbackseat.site/70694473277wiazq.pdf
    • https://cdn-cms.f-static.net/uploads/4456121/normal_602b101cb95eb.pdf
    • http://raffle.website/the_judgement_day_devices8kf0.pdf
    • http://tareworig.mywebcommunity.org/boy_scout_wolf_handbook.pdf
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/b319704fc5.pdf
    • http://eglo.club/default_ip_address_dlink_dcs-930lzf7yh.pdf
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/62d63752.pdf
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fed3a7213554.pdf
    • http://damvglaz1.xyz/30_day_green_smoothie_challengeezt27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dojorunubi.myartsonline.com/the_big_15_ketogenic_diet_cookbook.pdf
    • https://s3.amazonaws.com/vexeliku/kololivegidasudigopumorot.pdf
    • https://s3.amazonaws.com/wexukufedepim/12352533147.pdf
    • https://s3.amazonaws.com/wexukufedepim/what_size_tires_does_a_2012_chevy_malibu_have.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b61.bin
ca42b4f17ba376a3fc1d79a4de1420b5d7f998d75b148ead3e4b3dc013074065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B61 5596 bytes
font_01_sfnt_off00016e63.bin
324562b6cf39cc882ccf39225e76d8df95c2df341d6f58b4ab7e4440175274fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E63 12792 bytes

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