Malicious PDF — malware analysis report

Static analysis result for SHA-256 964bbc4d8c4824fe…

MALICIOUS

PDF

151.1 KB Created: 2021-03-24 06:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05f82b5bbc463aa183c39976f4b98d78 SHA-1: 88dbf38ec3968f981d6e0ce6d08b05f9de462639 SHA-256: 964bbc4d8c4824fe62a456392d3d0835deaa49341960bcd5d15ae034a835767a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9974

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 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://jottigo.ru/strik?utm_term=que+signifie+l%2527expression+en+bonne+et+due+forme PDF link annotation
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/vinid.pdfIn PDF document text
    • http://dufasobogunojat.22web.org/osrs_blackjacking_guide_2018.pdfIn PDF document text
    • http://bigmagazin.xyz/what_is_organizational_dysfunctiondk5nz.pdfIn PDF document text
    • http://piwosiberogam.iblogger.org/wujafofazilov.pdfIn PDF document text
    • http://autolombardpro.ru/mitel_5448_programmable_key_module_template22gk9.pdfIn PDF document text
    • http://nikecortez.net/what_age_is_appropriate_for_reading_artemis_fowlzxu2j.pdfIn PDF document text
    • http://kixubobumetorab.iblogger.org/zibewogafitufukesomi.pdfIn PDF document text
    • http://midekupe.22web.org/xipidikujigarejoziwe.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/533cb2a73719c6.pdfIn PDF document text
    • http://wigogaduxatinuv.iblogger.org/rapebifajonikibobomefezo.pdfIn PDF document text
    • https://jagojepenita.weebly.com/uploads/1/3/0/7/130739472/gejejexuwuwi_xigaxufotefod_lemopudese_nasufoxifeval.pdfIn PDF document text
    • http://rusherx.studio/final_fantasy_viii_perfect_game_guidez3kkc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padadubijimesib.epizy.com/56297784211.pdfIn PDF document text
    • http://zugugizifozuwor.epizy.com/vemewupalofetezavapuxonag.pdfIn PDF document text
    • http://gefifeji.rf.gd/runuzagupenimotosorogo.pdfIn PDF document text
    • http://ripifozuj.rf.gd/beast_mode_2_album.pdfIn PDF document text
    • http://pavefobigemaxe.rf.gd/bosch_silence_plus_46_dba_wont_dry.pdfIn PDF document text
    • http://bapaxezeb.epizy.com/marshmallow_toothpick_challenge_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a98ab7-ca23-4ca4-907b-2f9c9e924418/85923807675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13834eae-a9b9-46c9-b792-83d55c6dbf25/how_to_clean_upholstery_with_hoover_steamvac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f250984e-2834-49f2-a00a-d63ad256a075/dunebodida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55573d2d-e2e7-4732-929f-9868958903bc/66304642319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9670c4-4aa7-4f8d-871e-22b8ac5c7cac/can_scoliosis_be_fixed_in_adults.pdfIn PDF document text
    • http://zafagolakogud.rf.gd/86810599539.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_off0001f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F541 5452 bytes
SHA-256: 87d20232ce1bdf8d6c00fac8d21003afe232342199477a0e3c8bdad5b9d2a86a
font_01_sfnt_off000207c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207C5 14032 bytes
SHA-256: 1d5498aedc77fb1696b027d80f3198e86760edacda98001a40d0a5c0bb1189b6
font_02_sfnt_off00023653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23653 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf