Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9624bf8a26402…

MALICIOUS

PDF

79.3 KB Created: 2021-06-12 03:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb9956d2621347e32acadc6de059aecf SHA-1: 19a8878987c8b90ca9eb6e068c5b3676f293159b SHA-256: 42e9624bf8a264028a69b187edab13e7d83852c7dedce1403619750610220b2f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/pbw?utm_term=ozark+trail+11x9+vacation+cottage+tent+manual PDF link annotation
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/5030547defbab.pdfIn PDF document text
    • https://pelixenebedevo.weebly.com/uploads/1/3/4/3/134338689/29df74cdf2.pdfIn PDF document text
    • https://bogobesupagal.weebly.com/uploads/1/3/0/7/130775478/fitawixatitulutim.pdfIn PDF document text
    • https://fazuzuxidugijef.weebly.com/uploads/1/3/4/4/134475184/refew-xozor.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/magefumusevinafabog.pdfIn PDF document text
    • https://vusowosunuk.weebly.com/uploads/1/3/5/9/135975823/cf0a2d.pdfIn PDF document text
    • https://dofenerezi.weebly.com/uploads/1/3/4/4/134446603/ruveximanoxam.pdfIn PDF document text
    • https://guferewefozitak.weebly.com/uploads/1/3/4/3/134393558/0eaeaeb7ecd65f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/fc7001ab-d08b-4fda-89f2-12075df97a34/72222949312.pdfIn PDF document text
    • http://kaborope.pbworks.com/f/velulekerijisefifupaser.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419568/how_to_connect_veryfitpro_to_watch.pdfIn PDF document text
    • http://risodige.pbworks.com/f/puxojugavisod.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/pilowetovilunoxozeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e98e87-9d98-4b65-a7e2-18a3e18b57f7/pubg_mobile_lite_bc_hack_apk_download_apkpure.pdfIn PDF document text
    • http://nibenaxibot.pbworks.com/w/file/fetch/144739617/present_simple_and_continuous_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c658c837-3d72-423f-a6ac-19acbd7052e7/23309237877.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/145162731/english_grammar_tenses_in_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955caef7-410d-4615-afcd-0134d4e171d1/what_does_aku_aku_say_when_you_get_hit.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/maxulo.pdfIn PDF document text
    • http://bugedavamib.pbworks.com/f/arctis_wireless_pro_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfce1ff8-fb1d-44d6-90c7-67d43d76e585/dasovisipibosajamajowos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 5300 bytes
SHA-256: 2267fb3cec9e68ddf469124321ced2105576a17d5ad71cdd27cf42f7be273c5c
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 11048 bytes
SHA-256: a6e2ed21b25413ff257790f8826dfcc47e29878f4e764cd0f28078a3d2cdbf66
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230