Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcddb4b04fa11b15…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 15:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 358ee84339c6f354e6257d05aebfe56c SHA-1: b89cff5c2c0f8f52eb0d629189ac3237b59c7aed SHA-256: fcddb4b04fa11b157e008309a35c639bf34d7b07521dc843700f17cebdcb0683
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious external content rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/123?utm_term=star+template+png PDF link annotation
    • http://tegotapiw.scienceontheweb.net/candlesticks_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hgxRSgh/switzerland_english_language_course.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/90551113997.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/1e7c49e9a91.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/icJVhgk/best_friends_forever_rescue_illawarra.pdfIn PDF document text
    • https://fezugewibopav.weebly.com/uploads/1/3/5/3/135346468/3393178.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/fkdQggV/percentage_increase_and_decrease_worksheet_ks3.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/1qPhaYq/18668530139.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/jeg2jgb/4263709414.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/moruvodosubigiz.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/bBhiwXZ/paper._io_46_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/ajaCihP/kiliti.pdfIn PDF document text
    • http://detozube.scienceontheweb.net/kenichi_ohmae_borderless_world.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/jjThdif/powikumupamuwokewiru.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/ji4mgeW/53505457194.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/55984532857.pdfIn PDF document text
    • https://cdn.sqhk.co/farukisinu/yjahdY4/socket_client_server_example_java.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_2caed80f6211426c9fede2e679641574.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_e971e37b76de411da8bca7959f86540a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a92eac7d-ae66-4e2d-8503-a28815375307/beethoven_violin_sonata_10_program_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a539f5bd-2e65-4413-9623-424ba6983ba8/fezeweb.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_55f4bdc81bee466ebc4eaefb79a9eff7.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5064 bytes
SHA-256: 8080b26c865c2f10e2bc8174c572465fc25e226b258c5cb478b6444bcc7a5ecc
font_01_sfnt_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 11500 bytes
SHA-256: 9c27dfff76156e080a140698b48be82aaf4a53516aa197f6081aaeb20d5e234c
font_02_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2