Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8f81bfa45e647…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 00:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5e9fac9f228e7765d1f27c130dfc0c7d SHA-1: e15b89e82795047700a071a92cc98a5e4611298b SHA-256: a4e8f81bfa45e6471fe8f1a4eae17532b5a641776d3313641022759cdf06894e
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' indicate a malicious intent to trick users into downloading unwanted software. While no scripts were directly extracted, the nature of the link farm and the phishing detection suggest it may host or lead to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=babbel+full+apk+premium PDF link annotation
    • https://cdn.sqhk.co/kakapoxavu/diejbhb/96700143712.pdfIn PDF document text
    • http://jakor.pro/58987146675v6ddt.pdfIn PDF document text
    • https://cdn.sqhk.co/raxavetaletu/BicJhfK/393_number_in_words.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/cZgiV27/18778286161.pdfIn PDF document text
    • http://azalea.store/pelusedowafujebarewevafujn3xi7.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/gghgsig/salas.pdfIn PDF document text
    • http://flowerport.shop/best_speaker_for_fender_superchamp_x21m0fm.pdfIn PDF document text
    • http://blubadgehelp.net/39664057153oj9vx.pdfIn PDF document text
    • http://silvanozito.online/jevapidogumuzujis6lpa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_8917db74a5814647b8448956e6423d43.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_9fd288e5add34bc5b8e5de4ab1f0bf8c.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_5e80546a99e74128958e43019c68c610.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd556d96-f4c1-47e0-8e1e-b386f6e59d50/fur_elise_beethoven_sheet_music_roblox.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_f63ce6711a984a7b8394cc92e954b16e.pdf?index=trueIn PDF document text
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_a94d70d3bd654645be244c9517db24ae.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_5fbc7eeffd52447bbe3f1a82c90e6539.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_39d5e5d0cc3b40ce973cac82d7df22e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efae7812-b72d-4b91-85c7-35c482d3744d/zevupokumajimimavag.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_dbb3bd87c50245e0b4eaa3018cf87202.pdf?index=trueIn 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5124 bytes
SHA-256: 48d041ff161c2b45b31eb64ec335ab5dbc0f66ab2f4ff9709658983cea9f1e90
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 11088 bytes
SHA-256: 7b416aa69c76e372d0e95cacf261aa6143bab663926dfb2393c21d3e1ff0d3c4