Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffab05540e1c5755…

MALICIOUS

PDF

71.9 KB Created: 2021-06-06 12:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 29694bac1fb781bf1be00367098d5627 SHA-1: e63fba9f8150e33a99b3d3fa479b9c81f62bdeec SHA-256: ffab05540e1c57557830e195316a2ae1870982fd6fd6e7490ea94322da00155f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with at least one pointing to a suspicious domain ('coretry.ru'), suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with techniques used to host and redirect to malicious sites.

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://coretry.ru/pbw?utm_term=how+much+is+corrugated+plastic+sheet PDF link annotation
    • https://wanitovamuk.weebly.com/uploads/1/3/5/3/135303456/tuwosuwelavog.pdfIn PDF document text
    • https://ludikunoxor.weebly.com/uploads/1/3/5/3/135345671/bamune.pdfIn PDF document text
    • https://demizuxikeb.weebly.com/uploads/1/3/4/0/134000208/4719396.pdfIn PDF document text
    • https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/1916935.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/suzajoji_piladenuzetox_kabiku.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/8586508.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/lekekevapowegi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funesut.pbworks.com/w/file/fetch/144549411/1311761174.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144708165/jolobutigovivif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601ffd19-b48a-416b-b171-862e16c191fe/roald_dahl_witches_movie_original.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/foundations_of_aural_rehabilitation_free.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/xafaxezoxavepopafagaxoz.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/tabla_periodica_actualizada_2019_con_valencias.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/pebakukafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932bb12e-864b-469a-953f-c6f5c0cd722f/29551783079.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144479448/will_there_be_a_6th_book_of_gregor_the_overlander.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/how_to_measure_the_ph_of_milk.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/99505556771.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/pukipilamixiriba.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427554/vamawukomejuzir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a15470-f45a-41dc-acab-2a92b7134512/author_descriptive_writing_style.pdfIn PDF document text
    • http://zixereves.pbworks.com/f/psc_chemistry_questions_and_answers_in_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe1dd23-a979-432d-825a-1961c65c655c/how_much_is_a_scag_turf_tiger.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_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 5540 bytes
SHA-256: 3e4bba92093774e0ebdf51afc07ef57ce4a216222593fc3639b6bc0039902a57
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 9932 bytes
SHA-256: fe90476d99457e574033aec653d6764ae6d341011ae6a4bbc34c0e06890f9ef2