Malicious PDF — malware analysis report

Static analysis result for SHA-256 335c4f437e7b4859…

MALICIOUS

PDF

78.6 KB Created: 2021-03-04 23:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d89c17f6475b415b261ba3543963078 SHA-1: 98151ebf7321623f0a25c87113c34339b83c205c SHA-256: 335c4f437e7b48599e751012a67d08b1e440937f5098d506462fcce94c19bb2f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru/award' which is indicative of a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to distribute links across disposable domains. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly indicate a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/award?keyword=how+to+clean+filter+samsung+front+load+washer PDF link annotation
    • http://doordash.link/what_makes_a_good_team_player_interview_questionslwkh.pdfIn PDF document text
    • http://sq11mini.com/bosagukinurajopilileaux6p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_602ac22507c75.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/guitar_grimoire_chord_scale_compatibility.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_602c8b7d51e21.pdfIn PDF document text
    • http://maddot.space/berliner_platz_4_download25hq5.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/falkor_neverending_story_plush.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_60268a39562b1.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/kutufelixoxeg.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/sozuwugajoxu.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/fry_first_100_sight_words_in_alphabetical_order.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_5ffaa9e1c9b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_603d4b0e7c2e8.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/difixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guvivewemubalef.epizy.com/online_text_editor_without_watermark.pdfIn PDF document text
    • http://rezafenunuritem.epizy.com/xomekimora.pdfIn PDF document text
    • http://kikexufan.epizy.com/84017487725.pdfIn PDF document text
    • http://xivikinobuni.epizy.com/sumiziwimolifunikum.pdfIn PDF document text
    • http://xajetizefo.rf.gd/92619578462.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/how_to_use_the_rainbow_vacuum_cleaner.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/puvufifujegobizidezevuxo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010fe2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FE2 18488 bytes
SHA-256: ce0d3f0998e224d005134de5058432ccedfa30071c1f21e88003fb3cb51ff871
font_00_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 5488 bytes
SHA-256: a1b0ed343261eb279499d8691bae2fbf076258cd1d8838946b368d2453c849f7
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 9940 bytes
SHA-256: db1baa45e812d921a8586cf8799acbe56bd37fecaff1170ff3da59f71ea7d298

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