Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6f8fdff7f04742…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 22:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e3d51780df5efad519d00155c4c0bb8 SHA-1: 9cdf78f27c1e718be1595104978916e141dad9de SHA-256: cc6f8fdff7f04742c4b801c45ad7e819fa90044853f27fe45df8a40e82fd10bb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically pointing to a suspicious domain 'jacksth.ru' that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users to multiple external sites, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=sources+of+carbohydrates+list+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378390/normal_6044de19d5fcb.pdfIn PDF document text
    • https://cdn.sqhk.co/muresogus/I5jijdR/f._c._c._p_full_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_603c1dd1dee6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_600c20db0d1dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_5ffe28513cb33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5ff42e6686909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_600c354904e12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_601976f626b45.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/ZD8ssih/41773549539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fd1152de8185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601bdd1402371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/81082504024.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/wufolaburodegalidub.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/how_often_do_you_change_swiffer_wet_jet_pads.pdfIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/verbe_etre_et_avoir_conjugaison.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/goxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d187d7-9a12-43fa-a67a-da4dbfa22972/xixaxuziv.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/71753532116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fa8457-418c-45de-9e56-0a1d309dd9da/thinking_like_an_engineer_michael_davis.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/25934502242.pdfIn 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_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 5588 bytes
SHA-256: 6c87f62a8dfad4ecb747927389da294dff7df0cca5c40e04340a61f7ebc5a0c8
font_01_sfnt_off00010846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 12016 bytes
SHA-256: 105d73592091310ddebd27928d51169c8bb643fecb0d1071f782c2e6445b3331

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