Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdef99ebb6a7122c…

MALICIOUS

PDF

86.4 KB Created: 2021-03-08 22:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d6d3eebb253046434cfc1e2d228cd97 SHA-1: ee40274b404544fb55abde4a9c6dc30a4a92fd75 SHA-256: fdef99ebb6a7122cf3162b0db10e947c1be61e8b7d7bb5e9e935fdd0506bf05a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://jumiwimov.ru/123?utm_term=2010+audi+q5+reliability+consumer+reports, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=2010+audi+q5+reliability+consumer+reports
    • https://lokedidige.weebly.com/uploads/1/3/4/3/134315074/430f7e73a8bde9b.pdf
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5fe2dc6b998d5.pdf
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/4259484.pdf
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/da6fd5.pdf
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/6bc33d352.pdf
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/6909081.pdf
    • https://cdn-cms.f-static.net/uploads/4486060/normal_603461c4c6f2b.pdf
    • http://boost-store.net/75141168710c7c1q.pdf
    • http://ebay-coupon.ru/kafawarivip40f.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_6038b599adc49.pdf
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/xedububo-vobakirusixekoz-dadafe-garinamo.pdf
    • https://rojabufofunos.weebly.com/uploads/1/3/0/7/130776514/e4aef29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regovadeje/20136198310.pdf
    • https://s3.amazonaws.com/gidibesuxi/58923419430.pdf
    • https://s3.amazonaws.com/ninazarila/adding_new_sheets_in_excel_vba.pdf
    • https://s3.amazonaws.com/fadupazageraf/30862164916.pdf
    • https://s3.amazonaws.com/gisujubolidine/iie_open_doors_report.pdf
    • https://s3.amazonaws.com/memexelu/fatukokapede.pdf
    • https://s3.amazonaws.com/neviwove/arc_length_of_a_circle_worksheet.pdf
    • https://s3.amazonaws.com/wisuw/bjt_ka_full_form.pdf
    • https://s3.amazonaws.com/fukepez/java_7_mac_os.pdf
    • https://s3.amazonaws.com/risalenefazozo/loviziradamavi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105da.bin
28a62261f96ea310245fe00bc4cc2a420e9d8ce9a287421849912534ea2b3107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 3312 bytes
font_01_sfnt_off000111b8.bin
6b7f1d1b1ae20aae40ac571203b94495a5693d9a3c400181e4522bca66bc4b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 5944 bytes
font_02_sfnt_off000125dd.bin
f59d0d687cae1a26cb59af39d3750f7a85fc90f0f6e7d7ea648499b0050b3219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 11448 bytes

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