Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cf8fea604bfbb4…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 09:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0379b1f8ba8af901eccbf13daf1a0437 SHA-1: c092d75d800db8d5de136b9767b35f65eaaa116e SHA-256: 31cf8fea604bfbb4fe378b049e2db44def226cdc208133bc5b6a7ed849b8a754
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to drive traffic to various websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs point to potentially malicious content, and the document body, though heavily obfuscated, suggests a lure related to 'Cadena de suministro de toyota pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=cadena+de+suministro+de+toyota+pdf PDF link annotation
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/5084164.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/how_to_use_kitchenaid_mixer_professional_600.pdfIn PDF document text
    • http://tuzirawejaw.mypressonline.com/nonviolent_communication_book_review.pdfIn PDF document text
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/tezidaxivafobuwid.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/36939339785.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/accident_causation_theories_and_concepts.pdfIn PDF document text
    • http://kieverts.xyz/deguvorimujeporsk7v.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/tojejulamijiz_penelerulurevim_kemuwuzupovawu.pdfIn PDF document text
    • https://zawurufaxi.weebly.com/uploads/1/3/4/8/134861846/cb702c5.pdfIn PDF document text
    • http://vavazexowupex.medianewsonline.com/suxuteluvosu.pdfIn PDF document text
    • http://shoop-fg.ru/first_grade_grammar_worksheets_freettkjl.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/iec9giw/cv_template_design_word_free.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/2294209159.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/fgegjgc/talking_dog_toy_80s.pdfIn PDF document text
    • http://mon-cmso.best/203335022024gg4k.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/kemasewokazizukomiti.pdfIn PDF document text
    • https://gubulugovidenu.weebly.com/uploads/1/3/1/4/131406252/c32dd22.pdfIn PDF document text
    • http://notdull-eng.online/there_is_there_are_some_any_online_exercisesp3ipu.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://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_c88f461296764376b66a8a11a0e81909.pdf?index=trueIn PDF document text
    • http://rixigor.onlinewebshop.net/twilight_new_moon_synopsis_book.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_e2c8bfe60502418180dc87a1e61ff449.pdf?index=trueIn PDF document text
    • http://satawakerexe.atwebpages.com/how_do_you_get_rid_of_water_fleas.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_75c4fba7d2c94e098b373b2142eb45a4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5160 bytes
SHA-256: 6d24f203790fc5cd45e7b485740cdeeb74661a2ca0f169821ea3aff3a00928e3
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 11876 bytes
SHA-256: af59f708df329fcbbc47a7dff7a0009cd69502d1b3cf1ac5f9a05d2110861dd1
font_02_sfnt_off0001215c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378