Malicious PDF — malware analysis report

Static analysis result for SHA-256 48120dd92811ea54…

MALICIOUS

PDF

80.9 KB Created: 2021-06-08 11:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 98bf2eba541e020eb480cad16327e9ca SHA-1: 7ce2c7606cc52467b83edaa4966cfb15fc3bd80d SHA-256: 48120dd92811ea5449987106703f66286ee4fe3f8b235dc66886ee15f380ff38
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'size guide'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

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://inwebjor.ru/pbw?utm_term=uk+women%2527s+size+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fe914225c593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_60bd3b03e00c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_60262b2e0df7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_605dc3a5250d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470222/normal_6001e85f4af1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5fc82ae788f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460063/normal_6020a7a070bc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448536/normal_5fe34d6d4a923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448727/normal_5fec99b8ba89b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78859482-5658-440e-8125-964062d652b2/are_samsung_qled_tvs_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe88074b-49e0-4b8c-95c1-c029f97c9f35/wuzoganolo.pdfIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144531780/78535443014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5324b728-d87e-42f2-82c7-6ef9667afe3a/how_to_remove_front_panel_from_kenmore_stackable_washer.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144449118/electric_circuits_10th_edition_nilsson__riedel.pdfIn PDF document text
    • http://vonodatob.pbworks.com/f/portfolio_120-watt_12-volt_multi-tap_transformer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/763153bd-8e6b-4d2f-b1e9-b25403a3a5b9/orthopedic_physical_examination_tests_an_evidence-based_approach.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144621081/gizmo_student_exploration_chemical_changes_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96ed7c3-5b74-46a1-bc13-7a5d0862d5c7/88573712514.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/w/file/fetch/144624237/we_wish_you_a_merry_christmas_piano_sheet_with_letters.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/pdftraditional_approaches_to_the_study_of_comparative_politics.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/w/file/fetch/144596589/91407747626.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_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 5040 bytes
SHA-256: bb923cf7a559134012c20c1cfa80713812bcb60240fdff5323ffb0faffd5707a
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 11448 bytes
SHA-256: c39bbf214ae1c3166af130e141a40aa1b6923d1051fe8ae826dd9909a8dc27b5