Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d532884f8fa2d35…

MALICIOUS

PDF

84.5 KB Created: 2021-04-08 11:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8cf347cfcfa1b56ce7e2bf1904c57db0 SHA-1: 107c8941b0a6b51ab18d926c2fe01007e2997892 SHA-256: 9d532884f8fa2d35702c5b62a2a6a2623c78fd79045962f70042160798866499
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 0.9955

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://dugedepap.ru/strik?utm_term=happily+ever+after+kiera+cass+free+online+book PDF link annotation
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/novirilawi-nokusebabumal.pdfIn PDF document text
    • http://goods-amzon.com/41779333753x24r6.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/astounding_science_fiction_october_1953.pdfIn PDF document text
    • http://disconto50.info/adobe_premiere_rush_cc_2020_system_requirements0vdo7.pdfIn PDF document text
    • http://monongzhlh.space/ap_psychology_midterm_review_packetxh9n7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_606c556e95091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fcc02f2ca304.pdfIn PDF document text
    • http://trylait.pro/35352011037kyu2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_605d8476924ba.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/tetoveluv.pdfIn PDF document text
    • http://foyou.store/50039955675tw898.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/semizanedoparadilanisid.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/lonadatejasolabi.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/18631483393.pdfIn PDF document text
    • http://flathead.us/15511692572yq4t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_604fed75817f5.pdfIn PDF document text
    • http://help-copyrighteamservice.com/wsjt-x_android_download0u83p.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/what_is_a_bells_palsy.pdfIn PDF document text
    • http://metalllift.ru/penguin_reader_level_3_answer_keyb21cf.pdfIn PDF document text
    • http://ejqy.com/angelcare_soft_touch_baby_bath_seat_reviewo1j32.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/accounting_rules_in_english.pdfIn PDF document text
    • https://rujavuxubigiwak.weebly.com/uploads/1/3/4/3/134331492/08cc12cc40.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/acknowledgements_thesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6041352b7f938.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/citizen_eco-drive_titanium_mens_watch_bm6560-54h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubawakelu.onlinewebshop.net/southern_baptist_adopt_critical_race_theory.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_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 5336 bytes
SHA-256: 0c21cb5c802c63787fc80f78ebaf70cb14d0652d9aa824630d40a1604ce671ef
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11340 bytes
SHA-256: c978b1b7ab6db6b98f5b211bdda552389627a1e90c5a05ada983aa9ed2e85015
font_02_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd