Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd56dd0af72737ef…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 08:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac854304c110f5da62ea163b7c20adb1 SHA-1: bf78497ada786c5d4a578e08027b965f4fe27467 SHA-256: dd56dd0af72737ef672f41e553add30b6b37dbbe9d3a4ab39b044375121d88ed
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting or link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=ley+de+los+signos+suma
    • https://cdn.sqhk.co/tinupolureg/pjgiehd/business_plan_template_for_trucking_company.pdf
    • http://metaleagle.ru/23784785421hpedz.pdf
    • http://jixazepo.mywebcommunity.org/traxxas_tqi_transmitter_reset.pdf
    • http://chambreop.xyz/types_of_solar_thermal_systems_pptuvd7b.pdf
    • http://terem.space/57330790721ocm11.pdf
    • https://cdn-cms.f-static.net/uploads/4485445/normal_604d222d163fa.pdf
    • https://cdn-cms.f-static.net/uploads/4394077/normal_60240c733e689.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_60400216a4381.pdf
    • https://cdn.sqhk.co/pikuworano/3Qqhfhi/guess_the_2020_movie_name_by_picture.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://letutemoxeluz.onlinewebshop.net/47076239036.pdf
    • http://zijiwaras.onlinewebshop.net/89166239144.pdf
    • https://s3.amazonaws.com/lolaritemukole/gogavepevalawapoxipagepu.pdf
    • http://duxegejuw.atwebpages.com/carpentry_workshop_manual.pdf
    • https://s3.amazonaws.com/xomudufe/35745005936.pdf
    • https://uploads.strikinglycdn.com/files/55d0b4b8-f032-410c-a142-39b2e4d4d34c/can_you_use_a_vicks_humidifier_without_a_filter.pdf
    • https://uploads.strikinglycdn.com/files/c0094779-7a8a-4ae1-821e-8c50909e8e48/84411680568.pdf
    • https://s3.amazonaws.com/bisegilupuf/balancing_chemical_equations_worksheet_grade_8.pdf
    • https://s3.amazonaws.com/lakujusitejojet/latest_android_phones_below_15000_in_india.pdf
    • https://uploads.strikinglycdn.com/files/31c857e7-7e57-43a9-8714-ff8429c57b46/zukemel.pdf
    • https://uploads.strikinglycdn.com/files/94d3b13f-ba57-4cf3-ad88-7f042fb76e7b/formula_para_calcular_el_volumen_de_solidos_regulares.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_off0000edbc.bin
dbc49d12ef85d714cfbd1a6d9cfc6ab410fbc83cc96438a2d2d2dddd21af72da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 5092 bytes
font_01_sfnt_off0000ff09.bin
801289e5a0d45a9ab158b7ece7d9dbe63b3f9ec61788061c2c0906fb168c3c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 11320 bytes

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