Malicious PDF — malware analysis report

Static analysis result for SHA-256 993121ce786604ee…

MALICIOUS

PDF

76.0 KB Created: 2021-04-01 23:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47bda0b682292ff3b7c3b3e4c5071074 SHA-1: d96ab4b76dbf0f461d593f59814a5ecffedfa15e SHA-256: 993121ce786604eea53b803f13891f84d513dc356f18b8543e26f7fd03c940c4
126 Risk Score

Malware Insights

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

The PDF contains embedded links to external websites, one of which is identified as a malicious phishing domain. The document body, though heavily obfuscated, suggests a lure related to car seat installation, likely to trick users into visiting the malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=how+to+install+chicco+car+seat+rear+facing
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/8779764.pdf
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fda4d2834452.pdf
    • https://cdn-cms.f-static.net/uploads/4384649/normal_603a186d8f1f5.pdf
    • https://japejezapunat.weebly.com/uploads/1/3/3/9/133999519/delomexirefa.pdf
    • http://jinevul.mygamesonline.org/gibetit.pdf
    • http://movawizaxaxato.mywebcommunity.org/43263117246.pdf
    • https://gixefizavemo.weebly.com/uploads/1/3/4/1/134108956/c1f5f446b0.pdf
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fcd38b506d07.pdf
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5fceb5e4def96.pdf
    • http://kidobujugi.mypressonline.com/encyclopdie_catholique_tho.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_605798c86356c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1e61c493-f4f6-4682-9cc0-7719ba310f7c/jovafer.pdf
    • https://uploads.strikinglycdn.com/files/158dfeb4-ddbf-436c-b8fe-b905085ac510/53613950361.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/p90x_legs_and_back_workout_vimeo.pdf
    • https://uploads.strikinglycdn.com/files/af67ee97-cf5e-488d-b96e-e18df5ad559e/the_great_depression_us_dates.pdf
    • https://s3.amazonaws.com/tixedujegibex/dawn_of_titans_apk_free.pdf
    • https://s3.amazonaws.com/nonabafat/scrabble_board_game_rules.pdf
    • https://uploads.strikinglycdn.com/files/8f800fcf-de32-4030-b303-00da2875f811/gikunug.pdf
    • http://furunes.onlinewebshop.net/newborn_baby_boy_unique_names_hindu.pdf
    • https://s3.amazonaws.com/tolivajupeku/msi_z97_gaming_5_cpu_compatibility.pdf
    • https://uploads.strikinglycdn.com/files/b4191b2e-71ef-4523-86cb-37b7ec2d0aad/spt_humidifier_cleaning_instructions.pdf
    • 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_off0000ece0.bin
b0d472acd00c69a126aaa5c98b8f0158229e3ae247006c69e67bf7813a7c4207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 5196 bytes
font_01_sfnt_off0000fe9a.bin
b26b037cef81c8cf9f9c511767a32e47dd57c3685df7124fd5813f819119a21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 10620 bytes

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