Malicious PDF — malware analysis report

Static analysis result for SHA-256 938020512a3e05c4…

MALICIOUS

PDF

69.8 KB Created: 2021-03-24 21:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0d899f9559bd99d9bbef888e7e27a861 SHA-1: 24bf60b50620ea0f2f16b88ff4a5e607656f8009 SHA-256: 938020512a3e05c43d9d0c16c62c5b33218f3675018848c51de6534be1c1c681
186 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, detected as a link farm. One of the URLs, https://botokaw.ru/strik, is flagged as unknown reputation, suggesting a potential phishing or malware distribution attempt. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=white+christmas+lyrics+michael+buble+shania+twain PDF link annotation
    • http://xalowazejadiv.getenjoyment.net/sql_tutorial_oracle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/40468350928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac2916e-7ddd-4031-a12f-00a4be2436cc/71246415882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3e75ae-e22c-4a32-aee4-89e7e4174a68/what_is_the_total_force_f_on_the_panels_exerted_by_radiation_pressure_from_the_sunlight.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_c9a4a2810cb5410e94764e4c0e4d2313.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_22687f06816d448e9c99a6e6d78dd274.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_4a4209df3a7043e79576d091dfb2fcd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vajefam/nutrition_information_avocado_roll.pdfIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_91632c4d4d1d4737b936e23eb1387dd3.pdf?index=trueIn PDF document text
    • https://f516a5e5-1936-4b34-b436-a929b3a34b8d.filesusr.com/ugd/774001_0d6d6464dfda4f658e9440db084caab5.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_4fdf22e56a194a06abbd8ad845029115.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_7723aa9506d34bc589173ef42fd9ce63.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_e5fbb8830a224408aed2214f69c33578.pdf?index=trueIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_6a6520a8575a418a8f01dc97bcfd0aa2.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_2bd63cd236714c79a5a380f7034689f0.pdf?index=trueIn PDF document text
    • http://gupizamowakop.myartsonline.com/einkommensteuererklrung_2020_anlage_n.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/chloroform_formation_in_drinking_water.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8a671e-f34c-4ef6-a3db-9e9cc75b6eda/is_there_a_vacuum_that_also_steam_cleaners.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_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 5388 bytes
SHA-256: bb05ada0a59a95783323c6192d419eee28443a876a6a562ee2677d482bc39e5e
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 10768 bytes
SHA-256: f9ddee65fdf0d3ecbe07c0f98fe63385e2a908afc6fb174534fd794edc9ee359