Malicious PDF — malware analysis report

Static analysis result for SHA-256 8295a4fb9040718c…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 650ab0db6d7e4804c3b92b6b58f75624 SHA-1: 2cb6d2c9101e4c1512142716e27bfa131c24443d SHA-256: 8295a4fb9040718c6ac557a2970c36e4d26885044eb1f8373b7a16452345d3ef
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature, with the primary goal appearing to be directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=annabel+lee+commonlit+answer+key+pdf PDF link annotation
    • http://cuzinfo.ru/icarus_rpgzildy.pdfIn PDF document text
    • https://navubuxodogonid.weebly.com/uploads/1/3/5/3/135327143/7157073.pdfIn PDF document text
    • http://varietystore.website/somonasijuwofusuzimudvrahp.pdfIn PDF document text
    • http://bigowet.xyz/pujiwumoborukimac1wjl.pdfIn PDF document text
    • http://kogefidol.iblogger.org/atualidades_estrategia_concursos.pdfIn PDF document text
    • https://bazotopefinuz.weebly.com/uploads/1/3/4/4/134435952/xufekevojotala-matidozi-lipiromofasago.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/1931875.pdfIn PDF document text
    • http://apparentlyopt.com/oecd_guidelines_20177mlj2.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/138aeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_0c84e59720b34ee082f363a771cb3a1c.pdf?index=trueIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_6f8736522a9b4bc9808c6007e673427b.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_97ffdc78e78d413f811ad5addcfb5dee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/teamwork_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/how_to_punch_a_punching_bag_properly.pdfIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_195b2ec5e5e043379a3a3a70cb84e848.pdf?index=trueIn PDF document text
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_df551d7d014849b4a91348d4025185b9.pdf?index=trueIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_de33c15d5b0d4ddfb7ec978dfe8537aa.pdf?index=trueIn PDF document text
    • http://makatorujiru.rf.gd/faleveluzovukamizanixakuz.pdfIn PDF document text
    • http://zebajufomig.epizy.com/delavu.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_d8ceec0e64ed4c2482ada4e27f9f993e.pdf?index=trueIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_f83d3bea274b464d9fddf064b54fd7d3.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_6ec0c4b60a784c9ea4a5772b6d9bbf42.pdf?index=trueIn 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_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 5688 bytes
SHA-256: 5450fc8d795637b7845db644bd9c9cfdb0412bd9d24a4fc713ee9a4d9dc2142b
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 11392 bytes
SHA-256: 7c5490863850a5c9c98326c83e908a7b5d23ce738e507d18b87c06bc45856c03