Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dfd0fe226769c2…

MALICIOUS

PDF

77.9 KB Created: 2021-01-21 03:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f67279d24024e98ecbd7645e839bf09f SHA-1: ed791aaa44ca2179b1a0a52f3a1ecd5006e53a80 SHA-256: 28dfd0fe226769c236d3a1f840cbf29892382ea2cdd5deca849770176fb65252
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of multiple links suggests an attempt to lure the user to external, potentially malicious, sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=brad+cavanagh+trashman+age In PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/965846.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/tulizifolize.pdfIn PDF document text
    • https://site-1181017.mozfiles.com/files/1181017/pufamaviraxufupoxirifanim.pdfIn PDF document text
    • https://site-1176402.mozfiles.com/files/1176402/monozax.pdfIn PDF document text
    • http://fomaxos.22web.org/guild_wars_2_crafting_guide_1-_500.pdfIn PDF document text
    • https://site-1212086.mozfiles.com/files/1212086/dark_dungeon_survival_pro_ios.pdfIn PDF document text
    • https://sexozubo.weebly.com/uploads/1/3/0/7/130740033/potojogezarero-nidadowinuzaf-ratipokixelu.pdfIn PDF document text
    • https://vuvopovakufusoz.weebly.com/uploads/1/3/4/3/134342968/45f515be1ba87e3.pdfIn PDF document text
    • https://site-1166732.mozfiles.com/files/1166732/purulia_baul_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_5fbe1ad18cadd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd7040400603.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/1d87bb72cb576b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fca28768246e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wubexemetaxoru.epizy.com/subelusomepabedugesux.pdfIn PDF document text
    • http://dezezefisimel.rf.gd/kuxefame.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/33922522064.pdfIn PDF document text
    • http://zibinafo.rf.gd/skills_practice_scientific_notation_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/71714544427.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/perform_calculation_in_access_query.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 5060 bytes
SHA-256: 57a67d75118dd6c9ad743d3761fefa98dc44a76b3ab8d8f9a5e1c719ae7e1a46
font_01_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 11160 bytes
SHA-256: 6ed5bf74d6e771592bf123cc21f6f1a10c0f5c62928e4af4e75d6557d317efea
font_02_sfnt_off00011c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C06 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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