Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ddf829e0119f1c…

MALICIOUS

PDF

78.3 KB Created: 2021-04-10 22:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e8d9382461a3c46f801af6cad26380b SHA-1: 293995506d190200f6e0f72c6f9476dc6667bc3c SHA-256: 71ddf829e0119f1cec74c814bc04fa862c2847bb799d655b2c6361518e30303f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML classifier score indicating malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=que+es+titulo+de+asociado PDF link annotation
    • http://ruguwafe.scienceontheweb.net/simon_says_instructions.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/93752434774.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/fivaxodomukuxa.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/devi_bhagavatam_in_bengali.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/halo_effect_marketing.pdfIn PDF document text
    • http://apsmall.space/9068689634m2yfv.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/XumjdMK/water_slide_extreme_jump_house.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/jbhhXsE/42064199593.pdfIn PDF document text
    • http://topplafond.xyz/dusegurenajafu26j2.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/81113737894.pdfIn PDF document text
    • http://segwaywheelchair.ru/what_is_qualitative_and_quantitative_research_in_psychologyopwcf.pdfIn PDF document text
    • http://domainlimax.xyz/10922194842yw0se.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/why_is_my_admiral_dryer_not_heating.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/pujiruzizozit.pdfIn PDF document text
    • http://thrivewebs.com/the_sedona_method_audiobookbcgfo.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/hgnwsie/fallout_4_contraption_workshop_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f4ad2f-1677-491d-bb36-ec05cbcec119/momentum_masters_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95152e2b-3fa4-453a-b47b-bfa916ea024b/baby_gate_for_stairs_with_iron_railing.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_1a496f0973fd443da0c240c7f7776038.pdf?index=trueIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/50996451747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ba4f8f-70c4-4fdc-8efe-feedc5ecaac9/dbt_training_2020_texas.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_198b00eab12c4097b5b2aad3caa41642.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33cdefab-c748-4449-90e6-464d11cdb7cf/84826464882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c1edf8-6e09-4a9a-8a84-e8e61f4d5b5c/ingredients_in_wendys_spicy_chicken_nuggets.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_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 4896 bytes
SHA-256: 9e4e09b5843d24e4271ae4eee70f9e20db96d65a1e12912b40893882a843137a
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 11264 bytes
SHA-256: d40f22cf7b9f2e24ac267314b85218d9a8d662a0892ee3cb355fb64cbab91711

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