Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5d25987c3e95c4…

MALICIOUS

PDF

71.7 KB Created: 2021-05-21 19:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8357edc249626096afa65fae33b50f7a SHA-1: 51cb2de514ae141a963de59ed8c9b8bb1b3cd211 SHA-256: 7e5d25987c3e95c4ea8fdfbd41ea7d027591f721e2e61fe5ff60b9bea1f2d2a4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains like weebly.com, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=coats+1010+tire+machine+manual PDF link annotation
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/pilokogujeram.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/1872133.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/de6a1c16f7f74a.pdfIn PDF document text
    • https://biwaxosele.weebly.com/uploads/1/3/1/4/131437294/dowokolefa.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/1346156.pdfIn PDF document text
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/vixetowabiwagej-sopororus-lodiraxomu-dobuxinadegoxo.pdfIn PDF document text
    • https://wojemedirok.weebly.com/uploads/1/3/4/7/134724763/puwexasufuvinutavomu.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/sibexon_refulogupug_dewobixavexu_nutita.pdfIn PDF document text
    • https://lotinusola.weebly.com/uploads/1/3/4/3/134321880/notagerijo.pdfIn PDF document text
    • https://dovinaturaxamij.weebly.com/uploads/1/3/5/3/135349119/4486847.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/e5203.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/gewuki-batepefavamiva-vazowumupugiri-dojeseval.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/pizexopenaxu/92960046786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd51e53-8f3f-46bb-b49e-b9284dc0b108/what_is_two_factor_theory_of_intelligence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165f5178-0fed-42c1-a861-917f3519e518/washington_gas_bill_pay.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/47380360499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078196bf-d75d-4f77-b130-aaa0c4764a8e/gadofip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbf10cb-b406-4502-9514-d0bd3e079f6f/viruvik.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/killing_eve_season_2_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/how_to_get_spanish_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b79182c-2947-4ea5-91c6-f42e2646eb49/how_to_remove_battery_from_panasonic_toughbook_cf-52.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6de863-69e6-459b-b5db-6f64e2a163f8/mupimajam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1866cfca-2a2c-4e6b-bfdf-990d0b4c14fd/frogs_fleas_and_painted_cubes_answer_key.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 5140 bytes
SHA-256: c4f7e031becc81253c0d70b8ed9403161b393ec8af7c9578647e50e149e0bd4d
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 11000 bytes
SHA-256: 9dd3d7f3401b6257277121466eea0a60411f0285f77acd3417ca1457318eff38