Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b8d75956a5799a…

MALICIOUS

PDF

79.2 KB Created: 2021-04-16 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1f88aeb198c4c8f7d722cae3e08bf505 SHA-1: 23a538d011ac3fccd99e235fc77d6a325c77e816 SHA-256: e9b8d75956a5799a3e84487e02a27a138ac671a25c8f49f505ea61d029be3f23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it's a malicious redirector and a social engineering attack (ClickFix) that instructs the user to run a command. This suggests the document's primary purpose is to lure the user into executing a malicious command, likely to download and run a secondary payload from one of the embedded URLs. No scripts were extracted, but the presence of multiple suspicious URLs and the ClickFix heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://crophysi.ru/strik?utm_term=rock+candy+controller+not+working+xbox+one In PDF document text
    • http://dalnoboyi.xyz/98224530957fdevj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_5ffba4015dfac.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/0e13fe8243fd959.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/4hjgh6D/58855636256.pdfIn PDF document text
    • https://desagudag.weebly.com/uploads/1/3/4/6/134676200/492e4f5653.pdfIn PDF document text
    • http://oneplusonemain.xyz/63791916991rk6r7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffa1b3b74c52.pdfIn PDF document text
    • http://new-volosi.ru/zolidatiwevorokamowalejwplw.pdfIn PDF document text
    • http://axecheat8.xyz/11448105795cxezn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fd09a4761664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_60336d244cd06.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/gcYFbIT/bingo_card_template_illustrator.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/the_norton_introduction_to_literature_shorter_12th_edition_2017.pdfIn PDF document text
    • https://zuwositoxo.weebly.com/uploads/1/3/5/3/135315809/ninuputojos.pdfIn PDF document text
    • http://samettemiz.xyz/all_of_me_lyrics_filei2rps.pdfIn PDF document text
    • http://nupifijaw.getenjoyment.net/addressing_modes_and_instruction_set_of_8086.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/zakunafu/dasoselenafifa.pdfIn PDF document text
    • http://maxuluxusit.atwebpages.com/66519162254.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/game_age_of_empires_3_bagas31.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/agreement_termination_notice_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/bodega_dreams_book_2_round_2_summary.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_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 5400 bytes
SHA-256: c17cadd16c4b76c2b93f7603dfff7328f0b7d32ef9e88ba45b74acced3587d77
font_01_sfnt_off00010812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10812 11448 bytes
SHA-256: 01dfa8bcd6dffbae261af74a5437637aea3fd09707bf313ab124c3a8ec0cdbd0

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