Malicious PDF — malware analysis report

Static analysis result for SHA-256 2faa4a0775a9c09a…

MALICIOUS

PDF

89.3 KB Created: 2021-03-20 00:30:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e96541e78dfa06dd64b161f50db48a7d SHA-1: 9e51558b35119788e66dfabab561d5db063b8db9 SHA-256: 2faa4a0775a9c09a3cb668fb721bcdf79273f2b93c09dda8d09c83bc8f40267c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, noting a high density of links on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jottigo.ru/strik?utm_term=listening+skills+practice PDF link annotation
    • https://cdn.sqhk.co/suwojixuwebi/QpQhbu8/comedy_central_app_directv_now.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/wing_chun_1994_full_movie_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_604b6aa5d9dea.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/conversational_implicature_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/jdFhiHM/fuvenevazaba.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/9SUjfyp/lucky_mall_karachi_location.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/LhfhihG/nozegujojikufaruvovire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423699/normal_6033823fe7e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468294/normal_5fe2eb1724e21.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/chole_bhature_recipe_in_marathi.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/relataxasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486987/normal_60334838a35b4.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/ie0ZjfF/buzitegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5ffc2b1c55138.pdfIn PDF document text
    • http://desokore.medianewsonline.com/relapse_prevention_plan_worksheet.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/7c8d05e8-fe4b-4537-a9de-b0a0b64f81d1/ap_biology_lab_4_plant_pigments_and_photosynthesis_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3838a48-4b70-427f-a882-f39c1cebfd06/second_ashra_dua_in_english.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_26b067bc743a45cbb3297e9ad55cfc08.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_3efe64ab8dd24f498206fcc8ad4dea0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e70e8e-4fd6-40b9-b6f1-80093cf378be/gnc_pro_track_ultra_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90895afc-1c89-41ca-9cac-7dffc6e6eae4/90157103087.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_90dfc7f148a6461083c122f7d4c9a5a5.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_6566c2da724e46dd996e543733047e62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35995a8-65bc-459d-a9fe-4c032942521c/65807704766.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_5abe77cf3ce947daba5efe5f78003945.pdf?index=trueIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_446b99985bb94eddbece7c380586b6ef.pdf?index=trueIn PDF document text
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_a4a4331491b24f319f0848f94022ba90.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_9a150dc2e4da4e6f9c01c69e1d703d4d.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_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 5108 bytes
SHA-256: c48213fd48e88918d1b0d1cb54f8c6f1f7b385a2e53be69f3a888c42477a6235
font_01_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 10932 bytes
SHA-256: f8064bcb2655ce8b13cbd7bbe7661670076f22d920b3a514557b7414e9d1ba4f

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