Malicious PDF — malware analysis report

Static analysis result for SHA-256 729097f973a148d8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-27 21:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 83f5fdf1cb3131d3e9d2b4fe0f9523b6 SHA-1: d5c16378b6dad20f63ff4e2fb5690f716d0ff29e SHA-256: 729097f973a148d88a38618e05234e955aad0ff440cb2db68109be02297c26a5
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The presence of a large number of external links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=how+do+you+prepare+a+patient+for+an+ecg PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425912/normal_6004bd0edf3d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_6028a51fceaf9.pdfIn PDF document text
    • https://belatefa.weebly.com/uploads/1/3/0/7/130775380/059f13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce924db2b78.pdfIn PDF document text
    • https://geligike.weebly.com/uploads/1/3/4/5/134590657/belalesagexiwo-nasaxipiviwa-dasilotuk.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/387b82330bbe0.pdfIn PDF document text
    • https://tajirokobi.weebly.com/uploads/1/3/4/9/134901714/zafofofajifewal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_5ff788d418778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601fd809c95b9.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/defuv-zedegu.pdfIn PDF document text
    • https://vadiwolor.weebly.com/uploads/1/3/4/7/134737839/vefesakemi_guzizomewotim_binina.pdfIn PDF document text
    • https://pesaladijij.weebly.com/uploads/1/3/1/3/131382382/1123256.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/wexir_jebeguguxisug_jonolibol_rikatisab.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/lusabifef/dudedagifekim.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_d677e20603524b3f9d9bebd1ff69dffe.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_26dc53b4fdbf4b3e863fa49916b61110.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba7d8ae-7983-4a52-94dc-457ee267b06d/how_to_explain_standardized_test_scores_to_parents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d1bc48-c167-4e9b-9914-980868114010/76212195365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe1b0a1-5af9-41bb-875c-b40b085e7c05/father_and_son_clothing_contact_number.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/bim_execution_plan_template_uk.pdfIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_e065aed7d329441d9153d12f4baf5317.pdf?index=trueIn PDF document text
    • https://e474413f-ff6d-4b46-a00c-d4c33541206b.filesusr.com/ugd/ddecc0_a9b9e1a18627402ab0fb32ddffcb0363.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93ecb8e-75d1-415b-9fe9-6e6dc6b65fe6/dagadalulixevisejabolesor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 5152 bytes
SHA-256: 6644e86f72ac92cab2ea440b1016e1b99fae27adb0151fb3a789c3a5d9e7bc1a
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 10544 bytes
SHA-256: e1e6e8fc93a8e0695743eec6c622976b5d9c838b02f75c118de3c1668bc1661e
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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