Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f280bf0edefac9…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 06:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcfe02c55f5677295273b9adcdde719 SHA-1: 56a58a715e5c804402bb6bc963d12b4dc9b0fa46 SHA-256: 88f280bf0edefac9f7532baaaa22d1d1e2e42333f440d3cbc49e006aae632012
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or redirection scheme, with one URL specifically mentioning 'award' and 'zoning map'. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=los+angeles+zoning+map+pdf
    • https://vapifeti.weebly.com/uploads/1/3/4/7/134762900/pagenobiril-teruravegirorak-zipiseri-waxosikotu.pdf
    • https://cdn-cms.f-static.net/uploads/4471250/normal_5fe98be942ff3.pdf
    • https://cdn-cms.f-static.net/uploads/4454182/normal_603c170087b9d.pdf
    • https://zotizoju.weebly.com/uploads/1/3/5/3/135349435/lifuguju.pdf
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5feeaf721b6f5.pdf
    • https://cdn-cms.f-static.net/uploads/4452217/normal_6009f86cec2d0.pdf
    • http://rifijetuvijilam.medianewsonline.com/64272882308.pdf
    • https://cdn-cms.f-static.net/uploads/4421627/normal_600e812f67d39.pdf
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5fceb555c0295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_1a4b2195d91e4abfba2e9127bab507e5.pdf?index=true
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_3a981a3fade74e0b9dcdb33072c7cfa2.pdf?index=true
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_db0409cce162428c875d30dc0173f949.pdf?index=true
    • http://fuvuvadut.onlinewebshop.net/15406685276.pdf
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_2c6e0907f12f4d64be3ce1e973a1a275.pdf?index=true
    • http://kilarosine.atwebpages.com/75779968536.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d2.bin
fb5c08471f4156f4436c2f5a3ecc9c883d277dbb738a671c58a029ca4165407c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 5256 bytes
font_01_sfnt_off000102b9.bin
46a39768a2c32f07f448416dac0f774b83c5b71a43358ce9fa2a95ac5a867154
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 11668 bytes