Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f0512791cf39fa…

MALICIOUS

PDF

67.7 KB Created: 2021-04-03 02:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cadbb87db900134004acb6e3bd36f0b SHA-1: efa0f042db6ca509d2b14d258951630cfed01875 SHA-256: f5f0512791cf39fa44bfc2edd754637517612d7bf8f6fc40bef7d9ef151696a5
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=whirlpool+stacked+washer%252Fdryer+repair+manual PDF link annotation
    • http://gopubewigofopa.iblogger.org/16112722668.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/ahjLrsZ/velozobedi.pdfIn PDF document text
    • http://pejofewetoz.22web.org/24690767054.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/e6ijihg/yandere_dragon_x_reader_lemon.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/79373546806.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/liberalization_privatization_and_globalization.pdfIn PDF document text
    • http://wafesegagi.iblogger.org/blank_july_2020_calendar_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_bb07400f26894c3eb43d7fb65b5ae4b3.pdf?index=trueIn PDF document text
    • http://doxewadafexe.rf.gd/hustle_castle_beginner_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c297414-eee3-49bf-a35e-4dea74d729f6/jamman_stereo_anleitung_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e346f139-1875-4cf5-9387-2447f1ab1fab/bravos_xl_washer_5d_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2366965d-5fc8-4fcb-aca3-c5715e9410d6/common_yukon_roadside_flowers.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/gixowuxofoxupegetose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0515909c-3cce-41af-aea8-fcc04b5d1281/57824698434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce9d48c-7617-4dfc-a0d4-9651ed2ed957/60530038910.pdfIn PDF document text
    • http://topanuwawuf.rf.gd/97668777129.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/36526308726.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_0f22980b382749dc868700167c8680cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/chillar_party_full_movie_in_mp4.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_off0000ca9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 5620 bytes
SHA-256: 5c4971593265a3fd6cd14e048cd6ca73b5ac8d845111b197d15995f9df3bae1a
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10416 bytes
SHA-256: d9d29d74f7a0a047289bfea73dc917ddcee2a64f6a950f38d5a77077eb467b32

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