Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabf2caaa7b551fb…

MALICIOUS

PDF

67.3 KB Created: 2021-03-22 16:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 76a01242a8d2410be013fe187de45d0e SHA-1: 3f82183ad263a38e05c2ecbbda1383472f0735b1 SHA-256: cabf2caaa7b551fb137476cb61f4e686d453960892485e33bc046eb640712034
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://baarspo.ru/wix?keyword=uscg+epme+study+guide PDF link annotation
    • https://cdn.sqhk.co/waxipefimafa/ha4JjdR/dareraxuzaxexuboj.pdfIn PDF document text
    • https://cdn.sqhk.co/logulemuset/KSjgxjd/36294992705.pdfIn PDF document text
    • https://cdn.sqhk.co/pafitevet/afhihhW/ballinger_texas_death_notices.pdfIn PDF document text
    • https://cdn.sqhk.co/miburixegapu/cihhgij/3d_printer_metal_extruder.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/8LiiBuG/91136766934.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/baponovod.pdfIn PDF document text
    • http://fherixq.com/laduvofebuvj4ywm.pdfIn PDF document text
    • https://cdn.sqhk.co/sejukuxa/9ibjdig/winalajafagap.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/jgjg6lP/bricks_ball_crusher_pc_download.pdfIn PDF document text
    • http://legalvictory.group/que_alimentos_puede_comer_un_diabetico_con_colesteroljf42t.pdfIn PDF document text
    • http://astrohelp.space/bluebells_of_scotland_trombonenxt7h.pdfIn PDF document text
    • http://vvd.bar/supovirodolaxidmy38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_42100a9f05f54d2da0512795ac841ac5.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_1c55936b8ee143e8ae98006127a7ff95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b882d7-bcc7-4c96-a484-5a87e93ca7ff/dezurusuwabimajodide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0350c5-f33d-4cf6-a7fe-1eb1530408c9/2013_cub_cadet_ltx1050_parts_diagram.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/what_can_i_do_with_a_technical_writing_certificate.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_87c081959151445187ccfb38e3b92d38.pdf?index=trueIn 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_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 5148 bytes
SHA-256: bd1712987c620e349aa53728b8702907b4ac7ae606a94a2906f2d3fb8fe07351
font_01_sfnt_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 9980 bytes
SHA-256: dcff2521ce549f5dbe9bb4b3e2146d4ac5e3975885dedb091b3a2a2dc83af041

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