Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e5c6d9ccfdd9d4…

MALICIOUS

PDF

106.9 KB Created: 2021-02-17 10:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cd0f9ccbd7f06c85d7df091e32b0110e SHA-1: cc338b545bd95db882c652f0db5962b1ba4db89c SHA-256: a3e5c6d9ccfdd9d48a96aea7bd2ed9ccca53a1cb1b02680a36fe16fe65db8df3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://leonvi.ru/123?utm_term=atwood+8535+iv+dclp+sail+switch PDF link annotation
    • http://summerita.fun/tekesovotobekiluda62uh5.pdfIn PDF document text
    • http://cooldomen.space/what_is_the_word_for_art_of_conversation_in_hindideekc.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/3ngcZja/sup_game_box_400_in_1_plus.pdfIn PDF document text
    • http://islta.fun/57658386077t7bz6.pdfIn PDF document text
    • http://hookup153.site/pijuvijal0gdw9.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/iihfHig/how_many_seasons_of_warehouse_13_were_made.pdfIn PDF document text
    • http://infokurs.design/677300615945dky8.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/Yjhjjih/wepapebarolozijunaxojuv.pdfIn PDF document text
    • http://gakekasabikav.22web.org/love_wrecked_full_movie_mp4.pdfIn PDF document text
    • https://sukorajonivo.weebly.com/uploads/1/3/4/1/134108587/38ea0a1d74c7b1.pdfIn PDF document text
    • https://cdn.sqhk.co/kenoramof/duhasEf/messenger_rna_structure_and_function.pdfIn PDF document text
    • http://arboozfilm.com/hal_higdon_marathon_advanced7wu28.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/ijnfYT8/19504810700.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/55784198824y1xhk.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/hchegc0/nearpod_app_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/izhyjdW/guide_for_kick_the_super_buddy_bomber.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/d7iyige/green_bay_wisconsin_weather_hourly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fadakivok.rf.gd/islamic_calendar_2019_south_africa.pdfIn PDF document text
    • http://gifesikubelazu.epizy.com/childhood_memories_images_free.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/fokujefiwewox.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/dubivewe.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_off00014615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 8468 bytes
SHA-256: 88f03dd7f6ff9e2cd705eaf1bc1017ac341a02da6ae086cad53e6fbec2288042
font_01_sfnt_off000161c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C6 5688 bytes
SHA-256: bcded6aea7e0a96319ac72ece1de00fd1a13a9bd9631e96a20c51bab5ccc866a
font_02_sfnt_off00017542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17542 11772 bytes
SHA-256: df9241a8492a5e26338b0543a646b3eb0cae73b9df9d063a598b4c139c22fc6b

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