Malicious PDF — malware analysis report

Static analysis result for SHA-256 55567b98de2093da…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 06:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 668b66c59ac5e9674c9816bd9cfa5cf2 SHA-1: 8ef8a6245a2f696d9fa833ba335c256633c3afa4 SHA-256: 55567b98de2093da504a39cf016034b9d18d2378c7a0b8de19fa2bcd9f6eb384
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a malicious document intended to drive traffic to potentially harmful sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=malber+wd1000+washer+dryer+manual PDF link annotation
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/245acadbc.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/cBahfZ6/47454074164.pdfIn PDF document text
    • http://brumbum2.xyz/ninoputubijudajigzftvh.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/jjenifF/heart_problems_after_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/ihIt5gh/nails_done_by_lynn_los_angeles_ca.pdfIn PDF document text
    • http://samelike.site/17749948352sa76g.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/ghP8gfd/nivakezagibewu.pdfIn PDF document text
    • https://cdn.sqhk.co/fipakebeb/kgfyEia/rikamelagoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/jfRgjiW/xokele.pdfIn PDF document text
    • https://vezudarelewik.weebly.com/uploads/1/3/1/4/131482962/5b01ba1fd2f2.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/e0b1f2320ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/hbW1hjF/37975715200.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/77249361061.pdfIn PDF document text
    • http://copyrighytsupport.com/cakephp_form_control_disabled2o17h.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/occupational_respiratory_diseases.pdfIn PDF document text
    • http://devicesprotectionforusers.site/etica_para_amador_capitulo_7i5t4c.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/particle_swarm_optimization_algorithm_matlab_code.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/CtKiegg/vetew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapeperogu.rf.gd/fuweva.pdfIn PDF document text
    • http://kokutefuto.epizy.com/how_to_rearrange_pages_adobe_reader.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/gre_quantitative_exam_sample.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_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 5600 bytes
SHA-256: 82ceaad352b6d126e7c2c84efb189da6f4fb8d0602ec7450bea4ce1a7165e793
font_01_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 11308 bytes
SHA-256: 7da6d1f0bf13e3331147bce8338339e8fdb25632c43bec535e7b7a01f6a3b636

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