Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17734a69e553e8d…

MALICIOUS

PDF

83.3 KB Created: 2021-05-01 08:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9dd171420affd1dba21ccc76b8f31fa6 SHA-1: 2d4bb2c6ec4cb8ae00f72a3e9e1a1656eff2a15b SHA-256: d17734a69e553e8dddc476b9fb72727e068a87d07d218a5a209d55933231cdcd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=what+makes+country+music+formulaic PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443610/normal_605e121def616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_6056ead206c24.pdfIn PDF document text
    • https://pokakananame.weebly.com/uploads/1/3/4/4/134457622/c60ad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419628/normal_5ff32259b5932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_5fd2634ce0841.pdfIn PDF document text
    • http://chatik85939775.fun/14859583771o7vs.pdfIn PDF document text
    • http://instasavephoto.com/wedabopelasabe7jyrf.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/rowewapap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_60476d25e85eb.pdfIn PDF document text
    • http://ueuniti.xyz/medanetudotirawofixogoren7268e.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/5343a846-0e0f-417b-aede-683425833c28/rikki_tikki_tavi_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9155b1e2-7d7f-43f9-99b6-f9e1d128afa2/blackjack_table_for_sale_ottawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1480b45a-a6b3-4502-b127-202ab873cf52/watchmen_comic_chapter_summary.pdfIn PDF document text
    • http://satekivu.rf.gd/top_social_media_platforms_2019_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cf279d-1504-449d-88d1-bd14a98d588f/tosulukedumavijogitamix.pdfIn PDF document text
    • http://zivakafipudejiw.epizy.com/call_of_cthulhu_character_creation_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b77d0f9-0516-45d8-9c2b-af5fcaed5393/36056868652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f6e8ab-ac04-4973-9f81-13e34d7867dc/61519649887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37acf315-3375-4380-a8a2-73b43b553fed/binh_php_tn_t_v_36_mu_k_tp_37.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd690faf-cf4f-4136-b327-6fe0b5546d75/15950627664.pdfIn PDF document text
    • http://fowagamop.rf.gd/temofodajafusabet.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_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 5300 bytes
SHA-256: 449a50b5cb3f0de8738994edf509d3cfe6f7cf4920ec82388a8926e67241acbd
font_01_sfnt_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 12400 bytes
SHA-256: 55f17e54dc1b31e052f38bd4fd1379c14434b973e7dfa0fadbb7638a93fbce67