Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfe8bc66db7d5af…

MALICIOUS

PDF

88.4 KB Created: 2021-04-01 08:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4d158907a6b5e85b14408b52eec3a624 SHA-1: ef159bb3eab3b264bc2dfa311acc189200cab715 SHA-256: 4dfe8bc66db7d5af13aa7bede1bbf3e59a2220d91b2cbf552be6c361156cb0ff
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 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=roger+walker+clinical+pharmacy+and+therapeutics+pdf PDF link annotation
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/6755627.pdfIn PDF document text
    • http://bumegafonuvitop.22web.org/24521424427.pdfIn PDF document text
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/22546fbf77b5eb5.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/46ff1f6ce5dd5a.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/pirubewan.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/be85fa984ad6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ce3c407d-5756-49d5-af37-8b9b9d696d7e/24068689580.pdfIn PDF document text
    • http://jusudab.epizy.com/shark_navigator_lift_away_pet_vacuum_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/antena_pointer_pro_apk_gratis.pdfIn PDF document text
    • http://buweweja.epizy.com/pulidugusekujikexefoxorad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04841f19-14f6-4091-bcaf-b5b76a9809b3/rogekamomupafegaduzatu.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/free_business_advertising_flyer_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/50124201615.pdfIn PDF document text
    • http://xovupakitex.epizy.com/paxemisozurano.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/45385928102.pdfIn PDF document text
    • http://tewederukafolez.rf.gd/commonlit_greek_society_answer_key.pdfIn PDF document text
    • http://kekumedefiwewuk.rf.gd/best_guitar_music_theory_book_for_beginners.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_4daa0ff2969c4f8e9ae1063dad36bb23.pdf?index=trueIn PDF document text
    • http://fukogalijikufoz.epizy.com/kupokokewikokujotisof.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/57560441904.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_776ec9ceed59409ba5c3ad163520ee46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/is_heil_a_good_furnace_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b99dcf3-9623-48cf-b4c2-73aaf425a53e/is_captain_underpants_a_banned_book.pdfIn PDF document text
    • http://bimivopi.epizy.com/aluminum_sheet_rolling_mills.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001225e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1225E 18948 bytes
SHA-256: fc29f4f2405df37dab9141f40ea3a92bb397429745a36dd4604bbdfcb1abf5e9
font_00_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5716 bytes
SHA-256: 3d2dcdf60f28c5d10d64b168b958048965ec4f972e4253a3ec97d2c2c3c826c4
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 2232 bytes
SHA-256: 106dde6e9e871892022c021a392c17bb825f2c083b6ea991106530a69271d802
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 11212 bytes
SHA-256: dc789d804059747984fe64495a75ac1bd5249c5a2b900630a5dc056ca24cb64d
font_04_sfnt_off000140ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BA 2472 bytes
SHA-256: 85ae0fbcd874a4316fb051e9cd56a8a29548ba1dcb4e8da0e066431ec72f34b6
font_05_sfnt_off00014aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f