Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54896e6f4bbfc70…

MALICIOUS

PDF

75.8 KB Created: 2021-04-02 02:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c13ae2f740a432467d7a914ef6204a47 SHA-1: 56d73c77cd9c3716fc6291aed8942f924553d60b SHA-256: b54896e6f4bbfc709a63692fa742fe6ed3fbb2df86efe3f856a55fb758a01397
186 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 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 0.9997

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://midufefew.ru/strik?utm_term=how+to+change+a+bulb+in+a+whirlpool+oven PDF link annotation
    • https://cdn.sqhk.co/xizefonuma/jopifhf/flippy_race_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kowazodonaf/EhRicgf/bujaridetenawap.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/ihfiieJ/vibuduxufepog.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/chjoxFQ/spectacles_testicles_wallet_watch_nuns_on_the_run.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/ieK8rjd/new_ore_mods_for_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/PoTgdie/48203375856.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ojelCje/telehealth_definition_department_of_health.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jogakijifif.epizy.com/atomic_emission_spectroscopy_principle.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_7575b090bd36493bbb0571c40a4f438a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2524ca99-6fd5-474a-9eeb-79ba351561db/84186368497.pdfIn PDF document text
    • http://nufeluzuxaluw.epizy.com/2020_telugu_full_calendar_download.pdfIn PDF document text
    • http://fuvojofud.epizy.com/vusigivenuludunakipojo.pdfIn PDF document text
    • http://vulawogini.rf.gd/wonovoxapugunidifu.pdfIn PDF document text
    • http://povasapodojika.epizy.com/18619985367.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_ca49ba536bd64694bb264776f0134976.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_b43dda2d3e904359ad7902bc2f2e241e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37790680-1a3b-40ec-b905-fd1cc3677fd5/twyla_tharp_creative_habit_exercises.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_c026b760562f40e4a8977be6cae0ed14.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_f27f0eb1d7fd44d7b3883c71af84fe12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb422f14-7b41-4164-8531-fba8e1f80454/lukewetisosejogux.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5272 bytes
SHA-256: e900a85ae9fc3ecf803124dd7b68d2ad7a99b7df28e5f3a175cac33bed3bc7b9
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10584 bytes
SHA-256: 77b6d7f9dca5375bbe230304e85f36ec649263d69ac5e4a1b83142934cd163aa

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