Malicious PDF — malware analysis report

Static analysis result for SHA-256 3577dd794e7d7021…

MALICIOUS

PDF

83.4 KB Created: 2021-05-09 21:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b0ade9da9228cefe8440328f8482a807 SHA-1: b8be4e870d4391c3a79504e717b81dfb22fc5757 SHA-256: 3577dd794e7d7021f750ed6e5c9f2ec645eb728787a6432bb0406a4517f120e6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. One prominent URL, https://xezojetit.ru/strik?utm_term=calculus+limits+problems+and+solutions+pdf, is presented as a search result, likely to trick users into clicking it. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=calculus+limits+problems+and+solutions+pdf PDF link annotation
    • http://xupulakikovuxo.mypressonline.com/vesimepozu.pdfIn PDF document text
    • http://guzojowozufi.22web.org/integrated_circuits_basics.pdfIn PDF document text
    • https://navowilupaxit.weebly.com/uploads/1/3/1/3/131381067/woxoku_wigik_segalu.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/torubawefuvafozubebug.pdfIn PDF document text
    • http://vutajupej.iblogger.org/is_vizio_a_good_brand_for_tvs.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/likekuloj.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/vubejogonelokonovumu.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/wizetira.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://s3.amazonaws.com/xamibebulosaxug/laminate_sheet_manufacturers_in_bangalore.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/39409603181.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_3ebe879ac81344dcb7ff424da1ea4885.pdf?index=trueIn PDF document text
    • http://satuzolo.epizy.com/wolixabopevujinilifus.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/cebuano_mass_songs_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/how_to_fix_my_vitamix.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_416bb9b99ec04107b99a79b34f7f7d55.pdf?index=trueIn PDF document text
    • http://zivonupawidam.atwebpages.com/accsap_9_download.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_e7f7af675b23400698d06347a6409c58.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_20916258670540338745e31b9d595254.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 5344 bytes
SHA-256: 0fbe605d6e3bb7db537ec9268a2617f1bac87573276254bd365cc2294f87a170
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 11876 bytes
SHA-256: 00c23eddab38a500502ecbab2f8f0e5c41db5809dd65d4c35b1109c31b85785a
font_02_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230