Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639423a496d189b…

MALICIOUS

PDF

73.7 KB Created: 2021-06-04 20:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 16bfe110e352360b4d1b757b22d6818a SHA-1: 8be610438a2fd46b7a248c4f71dbf7bb2a8abad1 SHA-256: b639423a496d189b94764ceb02c06d171ad11d482bc2834189aa01cb4a5377ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://laborke.ru/pbw?utm_term=album+historia+natural+jet+pdf PDF link annotation
    • https://suzaxuboju.weebly.com/uploads/1/3/4/3/134386311/nuriravijunitegoneg.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/tigofaka-ligozu-mupavi.pdfIn PDF document text
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/kisedogedazur.pdfIn PDF document text
    • https://sajowomifekorur.weebly.com/uploads/1/3/4/3/134314212/9567698.pdfIn PDF document text
    • https://wajogivetiwi.weebly.com/uploads/1/3/4/3/134322864/gifajipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_605865fdcfa20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_6012c2b722438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5fe89a5a3b23a.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/543e9c6d-fe44-4ceb-a057-bef56199b561/fufofolenerokil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25c5fb99-f941-4321-9cc3-5e8206a848db/civil_engineering_drawing_abbreviations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3bdb49-6898-481c-bef6-328ea8e1314b/xonezutoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55ddae5-df9d-4633-9bba-5a476cd9e139/nofekopajubugala.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/what_category_of_virus_is_influenza.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/how_to_retune_my_panasonic_viera_tv_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfc37a6-fd28-49a0-894c-a989d5c0197c/brother_hl-6180dw_printer_driver_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7eb9cc9-43b2-40c0-a715-781c33de3c9a/the_road_not_taken_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0ff6b8-6d97-45bd-af6d-afbc10275dd5/rafael_orozco_novela_capitulo_54_completo.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 5484 bytes
SHA-256: 0002da48921d0c1f31712cfaa1ffc35f48d3386eddb84312431e1231e3b53943
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 11732 bytes
SHA-256: 3c01dc7a5de095b2a13e0d52096bd844e32100680f304c0cc05fe0e6ad125e2f

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