Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b477e026e68ff1…

MALICIOUS

PDF

79.7 KB Created: 2021-06-06 22:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 69bce28b4c11cf469da848f2aa87f08d SHA-1: af7b6996de15e1226f5d50e51c3433daae74b0d0 SHA-256: f5b477e026e68ff1913a9ac76b5540ad0d9f52a5a3039b6e682ca0b358b656d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect users to malicious content or download further payloads. The PDF structure and embedded content suggest an attempt to exploit users through deceptive means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=ballet+beautiful+dvd+free PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf7ec5e-f609-45f5-be3e-9364f122fa6a/garmin_forerunner_620_price_australia.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/can_you_use_google_docs_on_a_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b08744-6165-4a5c-8cff-33cdeebb9910/black_feminist_thought_collins_2000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d701810a-d3df-4174-8c2f-f43eeec72a09/polarevaw.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/80382478748.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144638337/screamin_eagle_super_tuner_pro_price.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/w/file/fetch/144732447/vezamosetebevadivalumeri.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/89028019831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a84001c-8e65-451b-92d1-9111280c11ad/dragonvale_infinite_gems_glitch.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144661308/watch_the_hunger_games_mockingjay_part_1_full_movie_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474b7c38-4aec-4f28-b6b4-fc97fa348e76/zixuxavaleluxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e892b9-8c5e-47a8-a21d-dd4d5803e03d/walmart_hours_tonight_near_me.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/patch_pes_2020_mobile_4.0.2.pdfIn PDF document text
    • http://pusurupufem.pbworks.com/f/57982345038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e53c25c-b2e8-44c6-aa5c-afc637a5325a/21657052200.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/iso_14001_internal_audit_checklist_xls.pdfIn PDF document text
    • http://lopasexosew.pbworks.com/f/bissell_proheat_2x_revolution_pet_pro_carpet_cleaner_parts.pdfIn PDF document text
    • http://jubujefaj.pbworks.com/f/rupekugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c349213d-46d2-480d-8881-121b5ac0a35f/stoke_newington_sixth_form_dress_code.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144442572/plazma_burst_3_hacked_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d738078-d1dd-4c42-8b74-d2f4250f3b92/tezareguxurejasixuxo.pdfIn PDF document text
    • http://bit.ly/21hAeWhPhilIn 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_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 4972 bytes
SHA-256: f74832845e4cb5186ea31376a97e01a90d930862b318292f5d5fde2d14d1b59e
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 11940 bytes
SHA-256: a048bdfdc1a315bf849f254a4e6d8bb14f1faa117819962f793d24a8f53f7672

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