Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb10490996b716f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-29 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4ef321b9b038b3f5d29124eb70cb10f5 SHA-1: 554f0b2c5a01d3d74cec51c4a14f3437c83f997b SHA-256: deb10490996b716fc63f3964411da4dee92338a3b9da20c7a0929c5a4c2ddea2
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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=how+to+use+wahl+clippers+to+cut+your+own+hair PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/baby_bjorn_bouncer_weight_settings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_60503e48a5329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_6002512be0ac1.pdfIn PDF document text
    • http://physcoo.com/1157527957974n0n.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/brickmania_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/cRBEgf3/today_news_cnn_live.pdfIn PDF document text
    • http://mandarins.space/3585239332530vwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_603dfe247b27b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_60473602a58df.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/74093571068.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/idhdcAi/street_cars_drag_racing_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/VUibXjh/chocolate_candy_molds_near_me.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/pegepej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ritoma/briggs_and_stratton_500_series_governor_spring_diagram.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/3413365282.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/mokotafojuk.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/rapport_onu_biodiversit.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/physical_science_textbook.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5060 bytes
SHA-256: e8d163d471d68c740ed08024d5ff47323f52b960e983151a9b95dd2ca80dc0c4
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 11448 bytes
SHA-256: 3c54917702ea2a9852145160273233a6854667efa81d0dcaeefa0ab737e8ffa2
font_02_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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