Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ccfa5a3b7f7b1…

MALICIOUS

PDF

68.8 KB Created: 2021-03-17 02:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5d3b3dc351c7541ec6bb4cccfeaaed02 SHA-1: 24c805276dcab0d93d82bdcc494167fef59da265 SHA-256: 5d4ccfa5a3b7f7b1a925ca38cffeab3151dce3ad9e1053ce981a8a92eeac7f9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one URL specifically containing a search term related to practice problems. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards a social engineering attack to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://gimoguvi.ru/123?utm_term=motion+with+constant+acceleration+practice+problems+answers PDF link annotation
    • https://cdn.sqhk.co/nuduniguwufo/iJifUih/multichoice_diski_challenge_results_2019_20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_6016c2c4f180b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_604cfa319a8ac.pdfIn PDF document text
    • https://cdn.sqhk.co/gogefaman/mniiij5/gemudoruvakilexepenepif.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/ifdhc2H/96779864703.pdfIn PDF document text
    • http://godevibusaxinoj.22web.org/97993559633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5fceecb1bb3bb.pdfIn PDF document text
    • http://suzepiju.iblogger.org/41861149076.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/iRcHfam/91586502118.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/hf7KgiG/free_rock_music_online_radio_stations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_60253b970a41b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darozux.epizy.com/76536189750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c0a58ea-ec0f-4762-a798-ea774ede6e23/polk_audio_psw110_subwoofer_speaker_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318ff36b-ff0c-401a-9548-8ac43a0f801d/intermediate_english_conversation_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67826de7-1ddd-4f08-b47e-a7506fa9046f/husqvarna_350bt_leaf_blower_review.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_36f642d8259c4c809467d65c2108540b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/gevukupirepipimid.pdfIn PDF document text
    • http://sawuliwinupunud.epizy.com/tewomowobuja.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/nitedider.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_643bd74351bf4abe94f7d2a12e128e48.pdf?index=trueIn PDF document text
    • http://wawebexitet.rf.gd/pejipoxatesuziren.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/history_timeline_template_wordpress.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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 5412 bytes
SHA-256: 058bcc413e3d76cac58ed7270053054a86db70a715b72bcb55b18067b1a1460a
font_01_sfnt_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 10676 bytes
SHA-256: 96d7f6367a61158b264d8f2b10c9fcecc2f824253bf86f1bdd69698ce3060f77

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