Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e7c985f00c6cf…

MALICIOUS

PDF

74.8 KB Created: 2021-04-08 09:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14ffc68736a41b94508818da86e6c08a SHA-1: 74cd497e6f40e23b37fdecf6d61d71374b46e37f SHA-256: 766e7c985f00c6cfd8ec3ae3d95f6a025069d1f207c2fc70073525ba829aa283
156 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 of which point to PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://jacksth.ru/strik?utm_term=formato+de+nomina+en+excel+gratis+venezuela, is presented in a context that suggests a lure for users seeking payroll templates. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://jacksth.ru/strik?utm_term=formato+de+nomina+en+excel+gratis+venezuela PDF link annotation
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/vowipodal.pdfIn PDF document text
    • https://pajobozonojamu.weebly.com/uploads/1/3/3/9/133997184/490233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_603e7ee06d0ec.pdfIn PDF document text
    • https://firalikagux.weebly.com/uploads/1/3/2/7/132740609/dofukukolubig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_60635240516dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_60176da050e77.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/7517331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5fdebb3428b4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_605ac3ceafe44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/zutogot.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/micdroid_auto_tune_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c7e190-a39f-4be8-b078-4474a63bcdec/what_are_the_different_anime_art_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/97014309563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5419fd0e-9224-4e7c-adbd-0f1448788444/asp.net_mvc_4.0_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/who_performs_system_testing_and_acceptance_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a724a7a3-1f82-4d68-b402-ad75b779e76b/64210802563.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/98696770073.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/android_ndk_log.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4e61d8-047d-4e16-8d22-7f2acff3aa8d/72383417163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841abcc9-e25c-4a34-ae20-976b745165de/how_to_self_clean_my_wolf_oven.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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 5392 bytes
SHA-256: 41109a120af3b98b426e653853760f62b0940fcea0137d43537992b8984feef6
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 11208 bytes
SHA-256: e4643b3e93c6f1472d60a8fc1094ce899d3875cd7ac9ab365907d42f028b465f

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