Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbba7d36c18b2fe…

MALICIOUS

PDF

75.6 KB Created: 2021-03-11 08:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8b7be137019aadbc990ada2564f2d25e SHA-1: d733500cb407bf063771ce10a0300ddde154229e SHA-256: 6cbba7d36c18b2fea4b6267a313cb45ccdab74b064e05eb4bea5b4eafd408d73
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs, with at least one pointing to a suspicious domain ('xajibur.ru') that is likely part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/award?keyword=cuore+cremisi+amabile+giusti+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6015d4f880441.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/fefonabamub56ejf.pdfIn PDF document text
    • http://reactivaperu-2020.com/what_are_the_best_penny_stocks_to_buy_right_nowmzssf.pdfIn PDF document text
    • http://useporte.xyz/agence_immobilire_formationtk3kq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5fdcbc535bb4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420014/normal_5ff6779d097bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fde4a8d8c5a1.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/61348022dn3j.pdfIn PDF document text
    • http://toppiksnack.xyz/internal_check_in_auditing_definitiono9n0e.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/995e38c7-bc1f-4559-8060-c5d6def31886/64966620585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc52c9d2-4230-4bbe-a536-436b53db42e6/tidulomokewojosoram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b36ad5-309e-4d13-89e2-c534afbf57f6/zilowetevalefi.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/wepamadubogojoputujolow.pdfIn PDF document text
    • http://xonukekavufimil.epizy.com/46103933180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78983f98-2796-4ae6-a6af-5f0216532f99/what_is_the_purpose_of_rh_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19efee0-f0b9-4182-95ba-4c12240d8d4b/how_to_download_microsoft_access_2010_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e0fd839-a64d-4fb5-a3d0-a46cedbdc3db/80500675147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8d375a-bae6-48c5-9e62-c79b0724a1f1/17544863000.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/pages_per_sheet_ngha_l_g.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8694ad34-375c-402a-a0b2-d00b0c01a62f/what_is_a_claim_in_argumentative_writing.pdfIn PDF document text
    • http://wobemiko.epizy.com/63747863227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fff1cf1-ac15-44ad-8b03-b48a91c232fc/dupotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c804069-5122-45d5-b607-c12d795e2315/amazon_kindle_3_replacement_battery.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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 5520 bytes
SHA-256: 0230e48ed11357aade8c6b519782afe09e91a47a03f86f38f34055fe9883e216
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 11664 bytes
SHA-256: dec7619258eb03ae0f3c01f0dd2929cb59db52e9e9a7ceb7bf9be3d9e3824f97