Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d340e02b68234d5…

MALICIOUS

PDF

75.2 KB Created: 2021-03-24 03:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e4165de2cc8aee9ba30bb682298d599b SHA-1: d9ddb24e73f78713ec93f0cadd757f1b993d03a3 SHA-256: 9d340e02b68234d524003149c8b73f4c4daf3504e0d847540658f3009ed04b64
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The primary malicious URL identified is https://dafemum.ru/wix?keyword=barn+door+floor+guide+roller, which is likely used to phish users or deliver further malware. The document's structure and the presence of numerous links suggest a link farm or SEO poisoning tactic to drive traffic to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=barn+door+floor+guide+roller In PDF document text
    • http://kuvenumine.mygamesonline.org/48982903632.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/wapobabojumum.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/bexazasiw.pdfIn PDF document text
    • http://taher-tcac.com/guitar_player_repair_guide_freecyesj.pdfIn PDF document text
    • http://onlajn-kassa.ru/boulter_buderus_camray_5_manualyp3nn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wixanarer/tesco_pet_insurance_ongoing_claim_form.pdfIn PDF document text
    • https://eaed964e-0a0b-4ad0-9c3c-caf45415070e.filesusr.com/ugd/4cd51e_a2bfedde7d094541a720d3ea7b985fc7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/26516690179.pdfIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/suwibosolumidisakigedisuf.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_97e97cd71c4f4f6184c9067e51ea5ffd.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_64e5297a6d7d47df98e961596de40c56.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_1e041d39d74c4f6b8bada1e57b27bade.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_4fdb3be5508f4ca7baa7abc14d97b080.pdf?index=trueIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_66e032f6e73c4759ac9ade76e8fe1abe.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_5e58855ef77441fca506c12eaf4d855b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 4748 bytes
SHA-256: 49c32eb4772b9bf9dabe38206bc0737955ba234093b70849c5ed7781e4c9576c
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 11588 bytes
SHA-256: f334b2cce011f0e3a8a3e2c813746fc6902c08153804274111a0d162bd5e5021
font_02_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3