Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de37767ac4db3c3…

MALICIOUS

PDF

79.3 KB Created: 2021-04-08 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3f82dbc856705dd3dca87bc9bde1848e SHA-1: b9e9a238ca2f52cd3b253d12281bb02c597a2794 SHA-256: 7de37767ac4db3c30fb8b05559ccc1da80b8bd6b9f356dc1562ce1e6db4b68f5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common tactic to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://leonvi.ru/strik?utm_term=denon+avr+x4100w+review PDF link annotation
    • http://money-team.site/9407739932700v2g.pdfIn PDF document text
    • http://zoo-taxi.site/how_to_eat_move_and_be_healthy_download_freetqntm.pdfIn PDF document text
    • http://uscreditinquiry.info/58528437624tqfbp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5ffa31e8c6b18.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/bad_piggies_mod_leading_edge_downloaddmizn.pdfIn PDF document text
    • http://smirnoff-optic.com/waring_food_dehydrator_dhr30_manuall2wog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421637/normal_5ffe4245c2f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_600affca6daf0.pdfIn PDF document text
    • http://lianhua.life/pagifylt82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_602182928a9d1.pdfIn PDF document text
    • http://fishing-rods2.club/adobe_acrobat_reader_windows_80bm00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_605d6cc57a725.pdfIn PDF document text
    • http://garantiya62.ru/22000370031v5uje.pdfIn PDF document text
    • http://beautysale.site/novena_prayer_mahimngt7z.pdfIn PDF document text
    • http://new-volosi.ru/57729111446rt00a.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://momentshop.website/xbox_series_s_amazon_prime_day18i6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_60629de4bb3eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_3cc3a4c7eb954663a03f6ea1435c443c.pdf?index=trueIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_7993930f8f6d4f0bbd5ebe1305257183.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_4008229088834434b572c006c0316437.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_becda519ac864f128d18af5a95a83e6c.pdf?index=trueIn 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 4972 bytes
SHA-256: b076adbc984b85a980ec28183546d4bbadbc4d2e07d7b40361f267aac1d539e4
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 11772 bytes
SHA-256: 29ec57276ffce7ab44bf154a2468c8f2fa7b2c6bc66fc6da1c2ae09ee9321481

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