Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34bae9428fd58a2…

MALICIOUS

PDF

77.6 KB Created: 2021-04-30 12:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ad1744d1ae185c70849655649db149a SHA-1: 4c06b6ee6bd37d40f600916d9715ec8b6c74de54 SHA-256: e34bae9428fd58a231a2dbf6d14097d49e78ca565d1126b64cc3b4d903a13f9c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=exponential+organizations+mtp PDF link annotation
    • https://bokozimub.weebly.com/uploads/1/3/5/3/135326123/88e1bef4.pdfIn PDF document text
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/06f46ed18d9.pdfIn PDF document text
    • http://nunakanatajupas.22web.org/adding_subtracting_fractions_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/75315f8f-9908-448a-b6e9-ca7f7bcb3eac/81037011009.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_9da51a98dbe441fe8beb5b9af38c2696.pdf?index=trueIn PDF document text
    • http://vabanenutulaki.rf.gd/fuvukiwikobipopipidipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fa6add0-9998-4b58-81ed-241a51533faa/rodgers_and_hammersteins_cinderella_1997_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/27684177040.pdfIn PDF document text
    • http://wodelava.rf.gd/jonexozuwer.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/laxojolodujamil.pdfIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_ca287871936c4d8a8087c3643aea45aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/vimedizixetot.pdfIn PDF document text
    • http://bupelasupur.epizy.com/719393617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53390029-d786-4b0b-b4d9-eda06d38f03b/74312073659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f547da-47ad-4215-89ea-63830e37b62a/the_art_of_game_design_3rd_edition.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_9e4b70d9883f4f98a19bf8cf24039167.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b7c2ef-76fd-4291-a8b2-7ba69ed9cccb/90020563537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97821502-14c8-4b90-9a43-234930939223/tugelinari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/151903e0-95a1-4eeb-8728-81dde3b753e6/joseph_campbell_monomyth_explanation.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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 5212 bytes
SHA-256: e4f26deb8872214a1db51258ada15ab868d0d7b752b9703a77adb75ff10abe1b
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 11892 bytes
SHA-256: 6765011c1f6a95d9bd99437263665e02ed68e0027a048d42096012cd54c7393a

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