Malicious PDF — malware analysis report

Static analysis result for SHA-256 842c3dfb94a04a44…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 07:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7d9522450983e9523f5ae0befb29f64c SHA-1: 909c8e3e8b6775b0e3b2d4983862671b7a701be7 SHA-256: 842c3dfb94a04a44d961cb7d22a1494ff178d61ced019cbd45ddc4f8b028a1aa
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 0.9992

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://jottigo.ru/strik?utm_term=how+to+draw+a+realistic+face+girl+step+by+step PDF link annotation
    • http://kixiwogazu.sportsontheweb.net/lunomekelunajo.pdfIn PDF document text
    • https://sowefitubi.weebly.com/uploads/1/3/1/4/131406610/bce2737da22.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/74866102597.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/e2c704a5.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/diwosexeliripo.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/5855877.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/why_is_my_spectrum_internet_box_flashing_red.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/7gj4gcS/jufer.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/hNiaNBH/jungle_animal_coloring_pages_printable.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/wuzewezabu_teseboxofaletag_dedaga.pdfIn PDF document text
    • https://lovizedisar.weebly.com/uploads/1/3/1/4/131437361/vowut_gazemiramare_zadopomokej.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/43538127695.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/23487362684.pdfIn PDF document text
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/xodonuji-vafuremisekifin.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/iheuhde/12487255174.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/sWifgfx/sokubebunebavawagitejin.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/the_holy_quran_app.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/kitchenaid_induction_range_with_double_oven.pdfIn PDF document text
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/cf19b5141ba45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/61318496005.pdfIn PDF document text
    • http://bodudubabafixe.rf.gd/debupi.pdfIn PDF document text
    • http://wififeju.atwebpages.com/panasonic_phone_kx_tga410_manual.pdfIn PDF document text
    • http://varunogozanog.rf.gd/indian_history_timeline_upsc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 5620 bytes
SHA-256: 72afe29954f7d47333995cb3918f0471e285ab369897def4ec4c7619256fddc6
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 10432 bytes
SHA-256: 696b98231bc9afcefc2387dedb6167f3e893a5dc16bfc47d7cf93d7a0d5fc9e4

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