Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe8a9b9c90ff78c…

MALICIOUS

PDF

80.4 KB Created: 2021-02-26 16:55:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c491f4aab09dd24fc746c3e397b102a2 SHA-1: d44160130b19f92992d4c96d6af5fb8ef6faabae SHA-256: 8fe8a9b9c90ff78c0f05d43d51a4f843844515e97678c0a29f5ce460df7bdc62
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document contains heuristics indicating it is a lure for free downloads and requests sensitive recovery information. It embeds multiple external links, with a primary redirector pointing to 'https://jacksth.ru/123?utm_term=unity+asset+store+download+package', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=unity+asset+store+download+package PDF link annotation
    • http://kesuvajeb.scienceontheweb.net/is_the_fender_champion_20_a_tube_amp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411479/normal_5fccd04d02d4a.pdfIn PDF document text
    • https://mitigifagoted.weebly.com/uploads/1/3/5/3/135325532/98777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388052/normal_5ffbcfee228f2.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/78606878310.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/what_is_complex_learning_theory.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/pikiwujusufesixoxesez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_60132365a49fd.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/4990203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_60298bc62acdf.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/donuzutagox.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/takurugilij/biblia_cristiana_para_jovenes.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/entone_remote_control_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/factoring_by_grouping_worksheet_answers_with_work.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/18037735470.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/gifalawusememed.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/where_to_buy_wahl.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_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 5488 bytes
SHA-256: 0eaa310583b0ed8c0d79164bfbcd75a88865ed7742bdf160630a32505ac861ab
font_01_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 10748 bytes
SHA-256: 1c38c4328dc151164dcb20caf5a4de9d72a707181deec12a39452ad1390afc9a

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