Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d64f312fe3ce79e…

MALICIOUS

PDF

80.1 KB Created: 2021-05-18 02:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c623841a0ffd342242116814b526aaee SHA-1: 128a9c4a32edcc3bd3a23296454aad99b5a16db8 SHA-256: 5d64f312fe3ce79e7053b079e189036813212a7b55c2afb272e297e5cb7997b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+much+is+a+room+at+the+grand+hotel+on+mackinac+island PDF link annotation
    • http://polirobivuf.22web.org/22981588226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_606497c71fa69.pdfIn PDF document text
    • http://xalebiru.iblogger.org/36302392239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_6049d82d31a25.pdfIn PDF document text
    • http://wupulij.22web.org/aluminum_sheet_metal_roll_forming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fcf66065a0d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499283/normal_60358b8e0d700.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/ca105a58-22a4-4152-9be8-326f8e1349bd/4021145418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4fbc8e-157c-4b8b-96f0-3498faa74a1d/wujumopazutuvokibivapor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b724f503-965a-4588-a8f7-63fd146757b0/why_are_gas_prices_rising_in_washington_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecaeaee-41bd-4049-bc2b-06fa95b64a12/59376649478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed617a13-beef-4fba-bffa-c469e13b1156/vimopurolonawapupanunil.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/kdigo_guidelines_defined_aki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7e9d5a-9dda-4538-94b5-d17d175f1e66/nitufefitoxexipi.pdfIn PDF document text
    • http://tixaxit.epizy.com/which_braun_series_shaver_is_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e215567-2f11-42dc-af9c-39926b6622c3/lefaxepesam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8eec43e-f7d0-4be2-b76c-a219ac22d01c/nugefinewetigojag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e806119b-f23e-40a4-8d19-dd14371cbb42/bufexapifakifapin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043d1513-98e1-4b8f-82be-f31271a71b10/inverse_functions_and_relations_worksheet.pdfIn PDF document text
    • http://xefujexomige.epizy.com/shiv_bhakti_audio_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba488108-3764-444b-9a21-091bc672ba46/dewalt_12_sliding_compound_miter_saw_cordless.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6939f5-7f59-4e8a-b33f-8b3ec8339d98/9097160640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8fdfa7-e764-4989-8e34-83d1347f2dd0/futadarugegoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740502b9-798e-40ed-9dd0-c4b2d111a492/nutrition_taco_bell_black_bean_burrito.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/what_foods_have_10_calories_or_less.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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 5468 bytes
SHA-256: 53e18a8e322df742832af176a83a21389c10db6a67fae9a5df1107f8e403dd0b
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 11132 bytes
SHA-256: 3f51d0fad496d2b9f7cae4bcd5defe4c0805f70897e91b7b534140cb2f3102a0