Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca113e6078cbd49…

MALICIOUS

PDF

78.3 KB Created: 2021-05-25 14:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dbf099083d00d8f590987962d8bc1fa7 SHA-1: 063ed4c5c749e8f47678b7d5e02e6716869cbd28 SHA-256: 4ca113e6078cbd49b85158af0a3a9f545bae27b67e60b08659cd892f6be86e75
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as phishing. The embedded URL and the document body's reference to a 'functional job analysis template' are likely pretexts to drive traffic to malicious or deceptive sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/wb?keyword=functional%20job%20analysis%20template PDF link annotation
    • https://fojozotewimoko.weebly.com/uploads/1/3/5/3/135324817/3100448.pdfIn PDF document text
    • https://jaxufeloz.weebly.com/uploads/1/3/4/0/134013101/2501841.pdfIn PDF document text
    • https://kijeluve.weebly.com/uploads/1/3/4/2/134266469/dozegudajalijik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_5fd97f1b5dfb3.pdfIn PDF document text
    • https://jutasosunefobe.weebly.com/uploads/1/3/4/0/134012390/fexejeviloxadegap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5feee7d768c1b.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/9292250.pdfIn PDF document text
    • https://pabelazulutibus.weebly.com/uploads/1/3/1/0/131070827/222c518f.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/2052436.pdfIn PDF document text
    • https://kanunobak.weebly.com/uploads/1/3/1/0/131070574/932177.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/35ba2ffb-26a3-4916-aadd-7d975bbc3e05/bufawogufigemolar.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/95944956007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8faf570-1524-4201-8cfd-b2d199f0677d/mepigaripeloxitomesovix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8929fd-54a8-4a80-aac4-6be25a9d863e/la_metamorfosis_los_personajes_principales_y_secundarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de444907-385f-40b6-bda1-5718c3373990/vemewodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aea0e51-dcd6-42fd-8548-c35ccdf6d16a/can_i_cash_out_my_trs_retirement.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/65694349342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6dae1e-216a-45a2-b249-0097f3519357/how_to_draw_anime_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/crystal_report_for_visual_studio_2013_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a64f828-434f-483a-93f9-7a60512a3ede/30194427664.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/34814810766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2ce95f-ae97-48fb-8c95-ddafd7d60c03/54242181535.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_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 5256 bytes
SHA-256: ad537d62d0a843883ad7604d7fc8195d27bcda34fe6a0cf94188a9cef9f42b1b
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 10592 bytes
SHA-256: 0928aef84308b19531fd350b697ca21cae917d9abd02b663d8eda6c9fdb9089e