Malicious PDF / .VIR — malware analysis report

Static analysis result for SHA-256 7d2f8e6721da9be0…

MALICIOUS

PDF / .VIR

156.0 KB Created: 2023-10-13 19:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2024-04-14
MD5: 8089a4f9649e8d96cd8d6f68a645d3aa SHA-1: 134d9643acad22536178e8d83b45c9144b70b60f SHA-256: 7d2f8e6721da9be0dee02192342c26ca178d50daec2109b566145295198d35bd
186 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0449

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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://genesaradafi.wirut.co.za/93196168895383894367802990?bumexinawumoxokewakurunatelulolagatinomageziporigunopuxobimejukaxepubowiboxidudelituwuzikok=xujukebemonedemozadagagiwigugubanetuxuzevorepujidigamujabutupilobifalajatisanifunagemewarugajomuminavefodibaxujekimixebatijixidikuxuwuwibelajanodozetivalobazutedevekixosopobudasefetavudimugadevupudixorobo&utm_term=alinity+ci-series+operating+manual+_english_+pdf&larivamavogiragorojudijulewojanawazadiwugunezilugavumofavoligekuxezimajokob=fiwomewakanutebitowotaloravawefurulefijafilaludowajodadutiseguzudejitejekosemamipovorodetepepaxunozixefopubebutaxumesilaxomezamegolulureba In PDF document text
    • https://genesaradafi.wirut.co.za/93196168895383894367802990?bumexinawumoxokewakurunatelulolagatinomageziporigunopuxobimejukaxepubowiboxidudelituwuzikok=xujukebemonedemozadagagiwigugubanetuxuzevorepujidigamujabutupilobifalajatisanifunagemewarugajomuminavefodibaxujekimixebatijixidikuxuwuwibelajanodozePDF link annotation
    • https://genesaradafi.wirut.co.za/93196168895383894367802990?bumexinawumoxokewakurunatelulolagatinomageziporigunopuxobimejukaxepubowiboxidudelituwuzikok=xujukebemonedemozadagagiwigugubanetuxuzevorepujidigamujabutupilobifalajatisanifunagemewarugajomuminavefodibaxujekimixebatijixidikuxuwuwibelajanodozetivalobazutedevekixosopobudasefetavudimugadevupudixorobo&utm_term=alinity+ci-series+operating+manual+_english_+pdf&larivamavogiragorojudijulewojanawazadiwugunezilugavumofavoligekuxezimajokob=fiwomewakPDF link annotation
    • 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://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off00022bcf.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00022bcf.bin)
🗂 Part of campaign: shared payload a02f67deb0 41 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BCF 14724 bytes
SHA-256: 5c07f43bbbfe327137aa0b052b0d8c1819da1e2182f59614a1a9bc0876adbf73
font_01_sfnt_off00025109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25109 8940 bytes
SHA-256: a02f67deb084b7ce8e02d7004994a9dd7e3132fe24919a42c6f0df6ed367c188