Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5b834de7983932…

MALICIOUS

PDF

84.4 KB Created: 2021-04-04 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 17c308cc3b42267d7eddd8ba33e42e2a SHA-1: ea11dff38824049384b11a147270d61b5a3845bd SHA-256: 9c5b834de798393295f531d40dc778ccbdb0c590af09bd7c43e5f5734803ceca
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to external websites that likely host malicious content or phishing lures. The presence of numerous external links, many hosted on disposable domains, strongly suggests an attempt to distribute malware or facilitate phishing campaigns. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://vilenefex.ru/wix?keyword=imvu+hack+app+download PDF link annotation
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/1322746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60625952cb67f.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/Dfja8gi/xufelazozojitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_60339ad6e3c59.pdfIn PDF document text
    • https://cdn.sqhk.co/jonawepatem/j5uhjuN/72433567449.pdfIn PDF document text
    • https://cdn.sqhk.co/bomikiwolug/hfeiauj/71030794196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387240/normal_5fed006a37c9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393901/normal_5ffbe64294455.pdfIn PDF document text
    • https://rimemukevip.weebly.com/uploads/1/3/4/3/134318995/a031db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fdfd15f79fde.pdfIn PDF document text
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/pesowibunebesuw_fosekugidasopok_bugugabaduluxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/hcPfpBO/83781650690.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/ijlJ6dz/minidrivers_f1_2020.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/42535987-95b4-4716-8cad-318b6c67beda/pubozaxedosotigewemov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b516d87d-9d4d-4f8f-acd4-3f391367440c/bebuwubakexurari.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_bba92a9f05e840f086235aed668eaae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0de1b7-b4cf-44f3-86a9-7092405ed64e/saxapodalejetusarisonebom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e12a942-48f3-4aaf-873c-7fa717a4828e/air_force_academy_requirements_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf530595-df4e-4846-a5b7-6935a7453fea/gamespot_cyberpunk_2077_review_controversy.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_63b298901f1947e5bec434fd278e9de5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb70c38-35d0-4941-8b04-72b2412a6a16/fawatazu.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_52637333964849899fb2ebb5856f03ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bc3563-d1b5-4ddc-bdf3-81723ccf8a6d/71108984573.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_d15a65c54b3e402d80bc96b476a408a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7441d0dc-9a1a-4b3d-8545-476180ec58b5/9922103480.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_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 5192 bytes
SHA-256: a27b53501651e0ce9a921431ec3dc4a98fa674dada90f482c1a2ffb2a38216a8
font_01_sfnt_off00011e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 11108 bytes
SHA-256: 6154cf8f9de67dabcfe9be7cae974b8a91b4ff4b09ce8b144756bd14abe7f1dd