Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac493473616b976…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 06:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d44935ec425fc9d5ac996e6f2aa7ca77 SHA-1: 93eb7596de393db7169581d3b9fb003e5b2938b3 SHA-256: 2ac493473616b976d6824f1f4eeb47c95e1e5f99d5e074f7f2b541c9edfa9220
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://druttle.ru/wix?keyword=bishops+weed+images PDF link annotation
    • https://cdn.sqhk.co/juvebuzizej/a9chflM/check_if_string_contains_substring_android.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/57620501532.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/Ujdjija/8411_heron_circle_ooltewah_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/hhe1Iib/zelidepatevip.pdfIn PDF document text
    • http://nafuvexozoli.iblogger.org/lg_dryer_code_f70.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/igtjdhf/does_proxima_centauri_b_have_gravity.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/voperevoxojivisadejasesar.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/chbjehe/gawujadowatis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mazebekivizaded.rf.gd/10th_class_math_book_sindh_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709b3be1-8197-4ec1-922b-55233aec2d89/52516277483.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c89b1a-9a08-44e2-b69a-526dc9584ccb/44727541815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1892b3e4-8bd7-45d7-83d4-15855330fca7/nugokoriwebuwasepagod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5726b629-4ceb-48f0-a737-524b9389dae4/niganenegotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661c7b2d-b4b3-4203-afe2-c4d1f6ba8bb0/6.0_powerstroke_5_turbo_back_exhaust.pdfIn PDF document text
    • http://kevikawimal.epizy.com/dabalajunotekazegudatedob.pdfIn PDF document text
    • http://xabimeweveme.epizy.com/48_laws_of_power_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e38c258-a85e-46dd-aa30-7d3ca4ffb6ea/bonatavipixowiseranozodu.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_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 5388 bytes
SHA-256: d5bdb28102246a827e436ef572de71ab80fdab0273884934c775edd7734f83a3
font_01_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 10956 bytes
SHA-256: 959d7b556a32d41275201304dd79634d4ef0957333ac73887b9cc3900f25dbfa

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