Malicious PDF — malware analysis report

Static analysis result for SHA-256 f033f3e1bc8ac938…

MALICIOUS

PDF

72.2 KB Created: 2021-03-29 23:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b34fc8cd767c9cf37475e585f9bf53a6 SHA-1: ee450264974a2be3c33e14e8543d34a0f5d92737 SHA-256: f033f3e1bc8ac938f5d9232dc1181d2c0fbee895100a2b87181e160c5d92c340
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with several pointing to suspicious domains and one specifically identified as a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=asuran+film+bgm+ringtone++masstamilan PDF link annotation
    • https://cdn.sqhk.co/tewisifupib/jekghjh/sewavalukipeli.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hjfR55z/posominofozujatezowivi.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/ggjjhbP/lego_castle_blacksmith_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/fhhii1M/unknown_pixels_battle_royale_last_stand.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/hTDuhes/small_mineral_water_plant_project_report.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/aDsyhaZ/stick_warriors_super_dragon_fight_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/8jihifA/tiwisukoxalir.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/hihcFjc/fifa_football_2015_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/Fhhjfie/xijadulexedozaru.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/cw5Ff2G/93558419257.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/xhbighf/60108445366.pdfIn PDF document text
    • https://cdn.sqhk.co/zewapoxi/gftifyl/ligogofizo.pdfIn PDF document text
    • https://cdn.sqhk.co/kotafuli/jjEGjdj/yellowstone_season_2_episode_8.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/cb360e24-3fcd-42a9-8a61-09d3f5b54437/bomavatibewibonunak.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/18784218992.pdfIn PDF document text
    • https://93641f3c-03d3-4c8c-b6db-0fd9bfabe798.filesusr.com/ugd/384ca7_576dc3df04ae41ec8ff518825c2ebc87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/what_does_it_mean_to_be_tough_as_nails.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/082506b8-4159-4640-b036-b16b1c0701db/41956302962.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_1b6f2681c7a74aadbee5459b14842115.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/95794424118.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5216 bytes
SHA-256: b9f153d3510c97e44ee75cd839678b7b186f7f1ad865b08817103b6697689d05
font_02_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10340 bytes
SHA-256: 39952e34cfbcb02e37c99fe9727eec39e4d83266df6550d9dace8713d9442c14

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