Malicious PDF — malware analysis report

Static analysis result for SHA-256 626fe857f0f154b0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-13 16:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fbacff123459a1c513780136459bdc3a SHA-1: 114369809410a017452119a8a8f09703c3ca7ff5 SHA-256: 626fe857f0f154b0c45980e0a23ea6afc615af6c2c8df2bcc45862876a0dfac1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external link farm behavior suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/123?utm_term=encyclopedie+des+plantes+m%25C3%25A9dicinales+pdf PDF link annotation
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/lomokidopexi.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/munafaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369664/normal_5ff26a14d8fb2.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/5039582.pdfIn PDF document text
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/7792822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_604bb9126eb8f.pdfIn PDF document text
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/7888126.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/gusosikowodofifesiku.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/1782526af3e.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/7706422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fcc2b033593c.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/farujitakof_vuzamogozop_guzoz.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/vetukoxufinoregin.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/71a272d3-75cc-4339-9c82-c23c8c04f15d/801704528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5779906-851b-4a75-9136-e6cfe1631558/canon_powershot_sx20_is_12.1mp_digital_camera.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_ce8a2013ffde4ac491062864772fdf9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/kumano_kodo_trail_self_guided.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_236e8220891d40e9ba229d885b6ca3f9.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_59337b741b6d429fb913dc117bdff594.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/22793740935.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_fdc0291b942648ab89eff97c5ff0ed89.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 5408 bytes
SHA-256: 867a4ad111aee793c4f162a3f75b60d5c84ebc37fd2e36384995c4fc4a68a965
font_01_sfnt_off0000f8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 13552 bytes
SHA-256: 3a495290da76a71496ee81cbe53febacff39b7fa98f5d97a6c74cecdddf70d93