Malicious PDF — malware analysis report

Static analysis result for SHA-256 415a1cd5544790b3…

MALICIOUS

PDF

70.1 KB Created: 2021-01-27 15:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cdf854e9c7eb6fac8ec0df2c063d8971 SHA-1: 7247cf8095efe6d753731d52e991cb3105ff5645 SHA-256: 415a1cd5544790b3ae0c5f98ea730eb5ede2bb0bb423adf7a39d76e5c24438e3
146 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of callback phishing or tech-support scams by presenting a lure related to billing or security issues. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, potentially for further exploitation or information gathering. The presence of numerous external URIs, some on disposable hosting, reinforces the phishing and link-farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/123?utm_term=cleveland+plain+dealer+archives+death+notices PDF link annotation
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/7067976.pdfIn PDF document text
    • http://ukranews.site/hallmark_tv_app_ukt5mym.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/remegowujugijaro.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/pufotakedetapuj_rusekolifige_bifavemom_bomabajepadex.pdfIn PDF document text
    • http://milanbeachs.space/sumatemmjy0w.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/muzinilavaviw_vebujoboda_polifuf.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/hihjihW/27291264363.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/hifGhhB/ragdoll_warriors_mod_apk.pdfIn PDF document text
    • http://arnautmebel.ru/kudoxejikebarobatiagkfg.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/f6adgim/yellow_frog_tape_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/Os9hi2O/spiritual_gangster_sweatpants_fit.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/fadupazageraf/heart_disease_in_pregnancy_rcog_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/animation_movies_free_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/sine_and_cosine_law_maze_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/44929969980.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/oxford_dictionary_app_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/excel_2013_complete_tutorial.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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 5128 bytes
SHA-256: e61a6f24d81f36353fa6046a07da1e60bf902c3879f8bfdbc58e3d9f871d6e66
font_01_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 10988 bytes
SHA-256: 3bf75d907bec1a3311d0d46cd39299894f577d7681b5e5abc8b46c230fa26470

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