Malicious PDF — malware analysis report

Static analysis result for SHA-256 31113ac409e3227a…

MALICIOUS

PDF

77.8 KB Created: 2021-05-30 04:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b082e7803ae955b05cd88d837aabbc2d SHA-1: 16df6232ce11be666d90b852b2add292f21ff01d SHA-256: 31113ac409e3227af6bca8f57d4e9e9cbed8d8626a50a45fcf56c73293d239b1
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 0.9960

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://jumiwimov.ru/strik?utm_term=how+to+turn+on+msi+keyboard+lights PDF link annotation
    • https://kuzigojuzomuw.weebly.com/uploads/1/3/2/6/132683135/pimukexefa_ravelax_liwesogotaros_dinajal.pdfIn PDF document text
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/teguvofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fde69c29e696.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/bixinelikefowup.pdfIn PDF document text
    • https://dexonakupo.weebly.com/uploads/1/3/4/6/134644734/sojuvesima-moxosenudi.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/2718000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_604f8e15c33e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464869/normal_60088d255d054.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/09eaec82-858e-4c79-8b33-c99350b6a27a/ksp_x64.exe_caused_an_access_violation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea97e07-832a-43b5-aaf8-1dbc820c0f79/best_nvr_8_channel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bebfe61-672e-495a-add4-6bbd4a9f4242/sikus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f02decf-5d5f-4826-9cee-c5c8329c6539/how_options_trading_works_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56349315-4633-4782-a6f6-c5ea6bf69da5/15721618248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7888472c-9583-4ad8-834e-2e1ba54d46fe/how_to_make_a_platformer_scratch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/795675c6-c902-4778-ae14-1bed33223ecf/gujikarugugedejijozem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a78eb60-eea8-4a3d-9cfd-1b77e2af2b18/why_cant_i_scan_from_my_epson_printer_to_my_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e32e3b-0584-44f8-8eaa-fe3a09801107/9371648260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3892bc86-a982-4b16-a06c-b4b624208c2f/dotuxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7429a498-d4d1-47a2-84fa-bedad181208a/15010084505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1b1706-32f5-4024-bff1-4c2a3280940a/vexagidatevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3749c9-2e1d-4019-8b17-dcb157c30a45/domevukumetitawiwowifopir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd55e9d-9009-4ce3-8e73-32bd86d31866/how_to_use_the_dr_brown_bottle_warmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fe3358-fd3b-4063-aca8-b2f7c0b1f95a/reloading_kit_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a595f73-194a-4877-aa0d-6b9de6045c2a/piretatari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe274a0-4ccd-4b07-80e3-e42372fb5953/who_discovered_electricity_in_lightning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474a931e-a55d-4916-ac41-b4b4aec8b5c5/88121732716.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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 5600 bytes
SHA-256: 75788e5401c8c184076d57dfce73e9fde4642f67fff77289871b26fc0e011493
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 11392 bytes
SHA-256: 42727a2716f85c4468668528d9cd3ca7e9d3c12e8c0539b904dfaef2f7fdd587

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