Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f252a11338464a…

MALICIOUS

PDF

89.8 KB Created: 2021-04-05 11:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 950f185533a8f742ea0bdd5823dfd1aa SHA-1: ace5852e70e3e4e617b5a1e3a343de3a37ae563c SHA-256: 53f252a11338464a9a0a043bc6a657c8c2c7dcb0b54e0a8763a5ea1a2c8c9dbb
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'Cuisinart coffee maker manual', suggesting a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=cuisinart+coffee+maker+manual PDF link annotation
    • https://cdn.sqhk.co/sosobita/ji5hcha/72849923556.pdfIn PDF document text
    • http://ledimpress.biz/690885620996isw0.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/chaJkig/username_generator_for_video_games.pdfIn PDF document text
    • http://hookup682.site/punozotrg5k.pdfIn PDF document text
    • http://remeik.ru/8045105335004pdi.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/jinhcie/31453022207.pdfIn PDF document text
    • http://unlockdeals.shop/woramuxikodaxajaxubenuo7f.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/xezutaremabatamiwojota.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvomuvugu/HjjdjcH/vakikana.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/gckhihd/calibrate_android_phone_battery.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/jagejunedur.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/7096886165.pdfIn PDF document text
    • http://ipai.online/why_wont_my_craftsman_garage_door_go_downdbqmo.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/gurafoga/xipabizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80daaa1-6e95-4a9b-94cf-316c3358d439/20960851650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4decbbb-bc59-4ed3-9eb1-7130cf4474fb/the_male_brain_and_the_female_brain_book.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_43d2f0ac2bae44a6a136f133365b4b03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61061998-98d6-49f4-b896-1945baf78951/how_to_help_child_with_anxiety_stomach_aches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642208c7-2a05-4763-8204-d4efaac03c73/nijof.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_260f3fa438ec4a6094f8b12c44837f7a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/rimatamelapimewevimulo.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_ab23dfe8e3de48b6bab9eb274b2bb26c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/where_is_the_reset_button_on_bryant_furnace.pdfIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_a47abef79e62475a92acbbf3aca2ee11.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_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 4996 bytes
SHA-256: b910327c6e6594b863e37b3df0016ec573ef75e0448f5581f9d337699943ccbd
font_01_sfnt_off000133c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C4 11112 bytes
SHA-256: 334cabcb4058855fd5543c5ff725a6f6392fe9c71881c1e84801b098f76d0e14

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