Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5d71b3de61aab8…

MALICIOUS

PDF

86.1 KB Created: 2021-03-24 21:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 372a4fb862a08384985a7b0bbae59d95 SHA-1: 8763cb8af20e1811775c21e2c1be8a4db358398a SHA-256: fc5d71b3de61aab8c188d98b248cfb7a45bb85eb991f0b50a4088dc70362b09e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://druttle.ru/123?utm_term=print+guidelines+photoshop', being a primary indicator of a potential phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute links across disposable hosting for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/123?utm_term=print+guidelines+photoshop PDF link annotation
    • https://cdn.sqhk.co/puwipaneke/hb0hdg1/rs_dash_asr.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/jhQdhfk/6460575215.pdfIn PDF document text
    • http://powerhdniy.space/tufututezupolond39hq.pdfIn PDF document text
    • http://vezerfa.xyz/data_warehousing_and_data_mining_notes_for_cse_6th_semq8qpp.pdfIn PDF document text
    • http://elinekici.online/kof_98_um_ol_mod_apk_download3z03n.pdfIn PDF document text
    • http://disconto50.pro/70740683135ea8b5.pdfIn PDF document text
    • http://theraisins.pro/how_to_filter_dates_in_google_sheetsff4cl.pdfIn PDF document text
    • http://idealicaitalia.website/17984533500deh07.pdfIn PDF document text
    • http://igme.site/moca_montreal_cognitive_assessment_francaistc7ll.pdfIn PDF document text
    • http://duxolaw.22web.org/finegusekelulixi.pdfIn PDF document text
    • http://yandex-delivery.cc/pathfinder_gamemastery_guideqcqrz.pdfIn PDF document text
    • http://mscgis.net/giant_shark_full_movie_2018d7rln.pdfIn PDF document text
    • http://com-copyrighit.com/how_to_open_seagate_external_hard_drive_xboxqbaj0.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/0229c23c-7fbf-429b-a558-f7bc3d6fd049/nitusofef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f9f451c-d997-4866-8c96-90e42d72c38e/bissell_little_green_proheat_portable_carpet_cleaner_model_2513g.pdfIn PDF document text
    • http://riromazadejiwa.rf.gd/bowukabezafedevoxotofomu.pdfIn PDF document text
    • http://sokobob.epizy.com/alimentation_saine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d817d4f-b402-41a4-9bad-e49840e62954/15801226574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308015a1-a7b3-4f02-b6d7-8dd23e1d0577/68908260296.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_7d0956c15fbb44f88144dc2145f6924d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e2e39b7-9f7d-4443-b75b-cbd6f1f8b745/66206879656.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_92a5f2be3a4849539d7303f555a069e7.pdf?index=trueIn PDF document text
    • http://jarawujutuva.epizy.com/50730900915.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_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 5012 bytes
SHA-256: fd117813d550d9d48bfad6b43a35bacf656bb2ec399d7ea164b0a7284075926e
font_01_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 10600 bytes
SHA-256: e8c708a748152acbad8c6197801ea49706ca463ad54ab0b27b5c46efa330fdbc

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