Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a1f1143b9dfd2d…

MALICIOUS

PDF

74.6 KB Created: 2021-05-03 01:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c7e1e3e6d6168e897259e467c5bf00c SHA-1: c909c9397b54c60a19ad70add6fa5119c44d64bb SHA-256: d4a1f1143b9dfd2d2eadf086dd8ea7e4c43d60d1db8d4188c96714ec94e24b1b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://bologen.ru/strik?utm_term=interview+questions+with+answers+for+teacher+applicant', is flagged as suspicious and likely part of a phishing attempt. The document body, though heavily obfuscated, suggests a lure related to interview questions, aligning with a phishing attack pattern. The presence of multiple external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=interview+questions+with+answers+for+teacher+applicant PDF link annotation
    • http://kivabixedopat.22web.org/story_robert_mckee_italiano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_60347fd284f93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456140/normal_5fcfa479bc4d0.pdfIn PDF document text
    • http://fufoxewiwiv.iblogger.org/que_es_variacion_genetica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/67379567868.pdfIn PDF document text
    • http://rukotig.rf.gd/economist_september_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cedf06-a768-45b0-a703-99600977a315/82997575101.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/how_do_you_record_accrued_interest_expense.pdfIn PDF document text
    • http://gozozofufeb.rf.gd/so_far_synonym_formal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b22069-4aa7-4e8f-8ad3-637645e8f38e/72768271176.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/firaxugogujagofosetof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45926d2-da5c-408d-8c64-328607f300af/2846055159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85800d51-05c2-4248-8fff-1e3229d73775/53598419049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d32963-2bf6-4214-b5b2-ca3350592bdb/huffy_girl_bikes_walmart.pdfIn PDF document text
    • http://lexevaliruv.rf.gd/hida_brownian_motion.pdfIn PDF document text
    • http://pikididubemet.epizy.com/arya_video_songs_free_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f93c387-52f9-41da-9a3c-20d7947e3b79/95276464055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb994e1-939d-49d2-b9cb-f9eb6a9d31fb/tomtom_start_60_hard_reset.pdfIn PDF document text
    • http://depaxagezesezaw.epizy.com/ethiopian_grade_12_english_textbook_download.pdfIn PDF document text
    • http://ninefaniki.rf.gd/how_did_ahsoka_tano_die_in_star_wars_rebels.pdfIn PDF document text
    • http://retuguru.epizy.com/loksatta_epaper_mumbai.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 5316 bytes
SHA-256: ab25125234acdea1844743aae4e7b64a765aa2a57d11512deb819b6fe4d653f1
font_01_sfnt_off0000f9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F2 10588 bytes
SHA-256: 1f4883e14bfe0cbff4b7df894910f40c36c912722b80fdfe45a3876c1bbde92d

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