Malicious PDF — malware analysis report

Static analysis result for SHA-256 991bddf5fb48fbed…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 01:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dbd91769386f44da95b99a818bc15253 SHA-1: c76091e88120098914c470f955c617fec4b45a83 SHA-256: 991bddf5fb48fbed7900b65c05ba2473850d4bb1b5ae473695269c832694aa8f
186 Risk Score

Malware Insights

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

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 0.9984

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=how+to+set+orbit+sprinkler+timer+to+manual PDF link annotation
    • https://rulovuwupe.weebly.com/uploads/1/3/5/3/135386045/lusuwubur_zasijuzorugi_vagezotabipuje_jokazo.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/lemogerebewen.pdfIn PDF document text
    • http://nuzidixiwetor.22web.org/2000_jeep_grand_cherokee_limited_reviews.pdfIn PDF document text
    • http://klossheff.xyz/tofawesuxasaraxetulatep71ju7.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/fonixovuxubojatud.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/Ujbfggk/66427329600.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/gjjjbhg/beli_pulsa_hp_di_jenius.pdfIn PDF document text
    • http://idealicacolumbia.site/learning_tableau_2019_free_download767uc.pdfIn PDF document text
    • http://zubiki.top/zowixebupa0u84.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/cortisone_shot_frozen_shoulder_side_effectsgt4ar.pdfIn PDF document text
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/6247108.pdfIn PDF document text
    • http://uablog.site/kindergarten_worksheets_counting_to_1006qux8.pdfIn PDF document text
    • http://arendaavto.taxi/garmin_55lmt_manualw2b7c.pdfIn PDF document text
    • http://jomotew.iblogger.org/41460775923.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/a13b38d52a4.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/dezozu.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/aLlx0hd/knight_joust_idle_tycoon_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/egccghg/zynn_app_download_apk_pure.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/jotanifirizosos-dizijalozod-lunumu-riranov.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/gghiigg/why_is_my_wells_fargo_zelle_limit_500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xobikiganerewen.rf.gd/jasas.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 5220 bytes
SHA-256: e8d153c6d43e9dc60c8b59cec099c828d089459a272b04fc52005d1b6386e13b
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 12892 bytes
SHA-256: 742f005e9ec964903dd9436c0b8ceb48b4f3b4ff6c6768eb3f1a8000e220f6db

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