Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a8e16f39b7e192…

MALICIOUS

PDF

80.5 KB Created: 2021-04-20 20:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a8fc8975de78bd6a9d4c9711860ed400 SHA-1: 2e2f42652448a029d625286cb23859650989b1f2 SHA-256: a3a8e16f39b7e192c3fea1b371705c8f748e3ba111ee5038839fd1e8a44941b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=movie+maker+apple+music PDF link annotation
    • https://cdn.sqhk.co/zofizitene/vjf5fL2/zokexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fde53274bc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_6043050ac81d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_5fd6fb593b404.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/gOhhmR1/tiliwafi.pdfIn PDF document text
    • http://whitetwo.space/city_car_driving_tofa_yamasov46u.pdfIn PDF document text
    • http://bio-ita.fun/nukajudiboputovejoxesime63wkm.pdfIn PDF document text
    • http://topdouche.xyz/emotional_labor_in_the_workplaceum5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/2yErIWc/cara_sign_out_gmail_di_iphone.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In 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/b2bc0b1c-5d18-4497-bb82-81b21f5f977d/5171166779.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_04eca002a40c4a2895ef8acdceadc268.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_3e1c4c3df08049ef8b565aa55ddca821.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_d778c4879e3b4e8281e4dfe1568f63d4.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_62ff2dce865a4daf91593ed379081272.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6312c6de-3507-4bef-ac79-1b5905c53b90/my_beloved_world_book.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_c28a8d83df634fbbba1d756611e341e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff28801-8681-4b04-860c-3599132b9e30/how_to_fix_f2_code_on_ge_oven.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_c66d31ebb7ce4d29948d61c29cb3ebb3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 6168 bytes
SHA-256: 0e87cd05f332aeb2a72b3daf131c0310eff8a4a40b86507956a7cca2f5d1d305
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 5208 bytes
SHA-256: 1d4d5d582f08b1de4085ff9f63b3711c4ae054eddd417752cdb90af5e9c2323e
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 10620 bytes
SHA-256: 6d4a781f9a9c618a066bf31170662e66a786acc8e24a239c932e5f07f6f4266e