Malicious PDF — malware analysis report

Static analysis result for SHA-256 72861e2b7e31d7d6…

MALICIOUS

PDF

90.7 KB Created: 2021-03-30 20:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 313021b1e869aa58ea7f7d2f70a961ff SHA-1: 2a18acbee72f1187747505fd2ad99b76e5c0a22f SHA-256: 72861e2b7e31d7d61353473b5895ba765d70f866a4c88abf8e54406fe4538177
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, 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 embedded URLs point to external resources, likely intended to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/wix?keyword=comic+con+2017+las+vegas+2020 PDF link annotation
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/2b4385ff9ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_602fcc9cb19ff.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/NAigjjs/memorix_notes_checklists.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/ggitzhf/50064696920.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/5ha9QhE/meaningful_beauty_daily_routine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417049/normal_5fc93482e862f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_605ac85c85e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fcb3884cf8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_5fd1878f2b27e.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/FWHheOS/domarimi.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/jgiRdrc/lajuneleguzejumububez.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/6860661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fcaef8c27c61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_605799d68826d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_601ad26873d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_602f7f3a74630.pdfIn PDF document text
    • https://wuwosafojopog.weebly.com/uploads/1/3/1/4/131407683/2114442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_be2b2b94bc5742509fdc1e11887a519e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/manualidades_navideas_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/22342505063.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/79990848574.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/extruded_aluminium_sheets.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_1c613c210a854a0681870838c2380e4d.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_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 5220 bytes
SHA-256: 62bc52b2c07d444ecaa76c32485ad8c5c86c1f5151b02788d3a13ed549f93b4b
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 11888 bytes
SHA-256: e577c515844efcc2f157215f3cff331e6b82f42e80ab319298d6601fcad3b2a3
font_02_sfnt_off00014f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F87 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3