Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c9872f6fdcac4f…

MALICIOUS

PDF

80.5 KB Created: 2021-05-01 21:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: addb0d715b706c9212088dee2d03a779 SHA-1: 1fdfef0b6733fa0f4af9d794045c49ea72d8a8ba SHA-256: 80c9872f6fdcac4ff258821d9753b33a1d22570a37bd0519eaed8d1d5c454bd1
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily garbled, contains text related to unit conversions, likely a lure to disguise the malicious intent of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=conversi%25C3%25B3n+fracciones+pulgadas+a+mm PDF link annotation
    • https://cdn.sqhk.co/pefisemise/igWiixd/love_live_soundboard.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/9d645fd1c214ba.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/hWHGHja/free_domain_finder_tool.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/77511185326.pdfIn PDF document text
    • https://tevejokufip.weebly.com/uploads/1/3/0/9/130969131/48780c.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/jgxKxjc/apple_mp3_player_how_to_download_music.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/cbGgBhc/77534389680.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/hqvgeji/tivesugaj.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/mopanegepukaserasulad.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/9K1mdCr/werewolves_2_pack_mentality_maker.pdfIn PDF document text
    • http://rejasikega.scienceontheweb.net/fifty_shades_darker_online_popcorn.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/vgdgjEU/gesupikabagujogeveviku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_601f1e0d11600.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/bavunulipudiz-fekunatibi-godamuduj-filamup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_6022c7508bdb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6054c8abe13c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_6051673cf34d3.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/gO5gijf/50183750322.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limoxukuk.atwebpages.com/tipos_de_amenazas_que_se_analizan_en_un_plan_de_emergencia.pdfIn PDF document text
    • http://tatesit.myartsonline.com/mawaki.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
    • 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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5576 bytes
SHA-256: e6c7f1983ab2020c66ef1801f4d11a33b1729c660a8b42174e3a92e8bae509ab
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 12528 bytes
SHA-256: f8468bfdc6e461ce7f65503dcf7c6122ca82efea5fcec257913804c6a029d8ee
font_02_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 16108 bytes
SHA-256: df002dda48ffbc6f6385b7668b64d3af09f68fbc2da909ce735eb4157b56ef59