Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c0f80b6843e6f3…

MALICIOUS

PDF

87.6 KB Created: 2021-04-03 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9c6cc0b031956e0254bee5250d868edd SHA-1: bb7298a6bdabdf923b291e594aca6e99f0223bf8 SHA-256: 37c0f80b6843e6f366e760f0321ede88baa5d4969f7c75551dc496c6485f59cf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 primary URL identified is https://dugedepap.ru/123?utm_term=reporter+gazeta+amharic+news.

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://dugedepap.ru/123?utm_term=reporter+gazeta+amharic+news PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464734/normal_604fd41fa09d6.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/ODFjdgd/atv_dirt_bike_xtreme_racing_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/iihhemy/football_manager_2020_mobile_tactics.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/hGjilhc/38410929301.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/iczjbig/four_guardians_four_flames.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ff282def0290.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/dgegfhd/alienware_area_51m_price_in_uae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_023c215df038441fbcb71f4a3a01ecc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e991b3f-6be7-4104-a614-3dbe7fc84d66/planes_y_programas_2011_secundaria_ciencias_tercer_grado.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7c102771e18d473086327b6f10da619b.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_073edb4759a04beb9672895673d39666.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_3d759c1c46854e37b92471c9d9584c82.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_8537a3426dde40939fd9954adf757ec2.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_b2637c93dc7142a58f9ed56b65986e33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f90ad12-2548-4594-b475-a3ca116c2b94/63695737531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd015dc5-5f13-4a7b-86a1-ec18e791c97c/htc_desire_eye_price_in_bangladesh.pdfIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_5370ea677a204678a0c885b3fd339b74.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 14844 bytes
SHA-256: 8e4fe2b53d4f874f9ff8e8ada92680eea0dd5151f566d3f0341ff623522142d2
font_01_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 5464 bytes
SHA-256: fd1163104c17b764173b831a9bc30f5040d724fb272124fc48e46211935e9692
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 11260 bytes
SHA-256: 07ea8a3faead660ef2c4800d7a171d52cc57a60732cee507f54f973afe49ab18