Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06f92cb59b37d2f…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 611bf6beecedce0230256e1ae1515a59 SHA-1: 95a94d3f2135df4de77e4d2ef8609bca114a6f69 SHA-256: b06f92cb59b37d2f97d39c83695b714cdf23ecfcbbf269171a614441991640f9
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users. One of the primary URLs identified is https://inwebjor.ru/pbw?utm_term=graphing+exponential+functions+worksheet+with+answers+pdf+algebra+2, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/pbw?utm_term=graphing+exponential+functions+worksheet+with+answers+pdf+algebra+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5fe56e3052c81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484639/normal_5fe41d742b0ac.pdfIn PDF document text
    • https://befetoxakotupo.weebly.com/uploads/1/3/0/7/130738956/8a9038397af8a04.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/mevejifotaj-bifude-mobokelana-rojat.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/51e61c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_601dbeee0c431.pdfIn PDF document text
    • https://zigiruma.weebly.com/uploads/1/3/7/5/137517675/5705080.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/jivitu-xisub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_604680e64a01c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601e70474cb93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fe81ba218d8c.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
    • https://uploads.strikinglycdn.com/files/2fc6a0d7-b1a1-4bb5-b3cf-41b5d67fbab2/hill-rom_total_care_bariatric_bed_manual.pdfIn PDF document text
    • http://zulamiz.pbworks.com/w/file/fetch/144705444/software_project_manager_roles_and_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab2e921-0cd7-46dc-9b6e-b304757c2461/how_big_is_30_by_30_inches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8eae39-1681-46be-ba78-1af94e241f38/38921604298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1da866cb-2e39-4913-8736-bbafe956482f/91688905239.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/87014850559.pdfIn PDF document text
    • http://kusarolox.pbworks.com/w/file/fetch/144680652/41898264323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9fe6a2-cdb3-448d-8b66-45f625396793/ejercicios_de_division_de_polinomios_con_fracciones_resueltos.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144426408/96350385726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd9637be-9f6a-4ba5-ac2d-ba44fbd69613/professional_development_plan_for_nurses_and_midwives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f6ad68-24da-42e8-89d9-0ec903ccb51e/new_video_games_christmas_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34d25d9-04e9-4153-8960-9170a85d9d89/61815110183.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5828 bytes
SHA-256: 13dc9772c0424214872c4d61c174f0ff64788ac57e34caf594be04f110f4974e
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 11404 bytes
SHA-256: 8f31fce537d4e11ccdc525e150f93c8ae8cdd77c90f0cb44ef0ac7349972f29b
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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