Malicious PDF — malware analysis report

Static analysis result for SHA-256 880ebb6a5d7b848e…

MALICIOUS

PDF

66.9 KB Created: 2021-04-14 18:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ce23dc999db01526a42d18c54bec5c SHA-1: 7f498801c44b179003c008d34d8eaf2a26eecfca SHA-256: 880ebb6a5d7b848e447c317b17fb1f66b0d75a72b118e3c157f9a1c78f150696
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'Maytag 3000 series dryer repair manual', intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=maytag+3000+series+dryer+repair+manual
    • http://nedavupagisezim.mygamesonline.org/17516485715.pdf
    • http://mojenisijita.mywebcommunity.org/gexidulif.pdf
    • http://jonimowar.iblogger.org/applied_linguistics_research.pdf
    • https://cdn.sqhk.co/zujarepifej/fhbqcfa/gun_shot_fire_war_game_download.pdf
    • https://cdn.sqhk.co/pukikojat/giBmd0y/mapuzodefosatikofetotemax.pdf
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/jisigefelujobe-tovirajiza.pdf
    • https://mixufatinir.weebly.com/uploads/1/3/0/7/130739404/4764276.pdf
    • http://xunetokawetik.sportsontheweb.net/fijuzoxudavebojugaxo.pdf
    • https://cdn.sqhk.co/mirofifuba/0rsoO4J/prognosis_of_breast_cancer_recurrence.pdf
    • http://meduduwaje.22web.org/android_auto_day_night_mode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jizemefuzix.epizy.com/electronically_sign_android.pdf
    • https://uploads.strikinglycdn.com/files/b143f635-20ad-40a6-b5e0-7b089f50bc07/taurus_pt111_g2c_9mm_bullets.pdf
    • https://uploads.strikinglycdn.com/files/9dc67c1d-0528-455f-9c1b-1e790c5d3683/dish_network_channels_by_zip_code.pdf
    • https://uploads.strikinglycdn.com/files/c6726589-361c-42eb-8184-570f375962dc/what_does_typography_mean.pdf
    • https://uploads.strikinglycdn.com/files/0f2e5530-3109-42e9-b825-2daf89f0130c/ipad_mini_5_price_in_bangladesh_2019.pdf
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_415f2171cae242c5b6a79b2fba27bc27.pdf?index=true
    • http://pawuvunof.epizy.com/fulavawa.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_bc410cd04f8b43f294ba7c475e1cbd3a.pdf?index=true
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_8b5b8868cc574afa82d5c763a32d9e9e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa6.bin
88e8487d02dba28bab3afa7703b97b144682e89550f973dbb210a20ceb1f0c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA6 5692 bytes
font_01_sfnt_off0000de06.bin
e37f90e57b8c85c809dbca464b674582194def2c4d0b0ca9bc03ced739de2260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 9408 bytes

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