Malicious PDF — malware analysis report

Static analysis result for SHA-256 1635835ebfde821a…

MALICIOUS

PDF

77.0 KB Created: 2021-06-10 08:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 919eddc384a0c706c2d53d1b557d6271 SHA-1: ce2f40ec5084edbea37e62da7434ee96fd19bb9a SHA-256: 1635835ebfde821a7a1638bb415798ac6bf839d27c2aec0a0408337a5d7e0b2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of 'starmaker lite mod apk' in one of the URLs indicates a lure to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification.

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 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://infrive.ru/pbw?utm_term=starmaker+lite+mod+apk PDF link annotation
    • https://nebavorod.weebly.com/uploads/1/3/1/4/131406600/0383ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_6058b504d4076.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/mebepimadaleded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465548/normal_6018033bc20d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_606a0a45b622c.pdfIn PDF document text
    • https://vuketuwanez.weebly.com/uploads/1/3/4/5/134592446/3972545.pdfIn PDF document text
    • https://dukezowe.weebly.com/uploads/1/3/4/6/134602160/0817fa4800a.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/zadutotino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407304/normal_6065f278ddb49.pdfIn PDF document text
    • https://watekoruruvuwup.weebly.com/uploads/1/3/7/5/137516493/tadunolef_dezoranu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_602938c440afc.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/mexugifopogasakebuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377120/normal_601b3610d8555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuzutoli.pbworks.com/w/file/fetch/144653838/lezipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8f562b-38e9-482e-a47d-2888d3f7c460/briggs_and_stratton_vanguard_23_hp_valve_clearance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9e51a0-358b-4f23-9682-79b3e9ee3d6b/53_bank_apply.pdfIn PDF document text
    • http://motekus.pbworks.com/f/universal_declaration_of_human_rights_answers.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/esic_form_7b_free_download.pdfIn PDF document text
    • http://vinivat.pbworks.com/w/file/fetch/144782730/cuantos_es_2_gramos_en_libras.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 2952 bytes
SHA-256: caf729fe438ab2bab5071c73002de27d6ed0cbadb0ef907ab17b26e1208c815c
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5092 bytes
SHA-256: 6f8c9e26d43ed29553bcae6df6c6fc8325cd47139acfec14c7ff8390696023c8
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 11412 bytes
SHA-256: 5085c2676654da8e326309b39f20ec065793939050ca76ff2c800603a783d9ce

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