Malicious PDF — malware analysis report

Static analysis result for SHA-256 52428a8e259a4b5e…

MALICIOUS

PDF

88.2 KB Created: 2021-04-06 06:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74bfcaf077502267e69b84f1411d9521 SHA-1: 7bbb13c4fd6ba2cd272d5c5e8c010e09cee2f74d SHA-256: 52428a8e259a4b5e35aeefdc85e6c9f609432047dc232c4028774dfc1db36fdd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to golowaki.ru, which is suspicious. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/wix?keyword=orion+50mm+guide+scope+focal+length
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6015631392e55.pdf
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/zuwimo_jetegu_gumojoja_gomibo.pdf
    • https://cdn-cms.f-static.net/uploads/4455381/normal_603c305867cfd.pdf
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/xikufomere_dedufenawapewok_migisenomepo.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_602de37e9c58a.pdf
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/3793719.pdf
    • https://cdn-cms.f-static.net/uploads/4470685/normal_603f6789a2566.pdf
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5fdda52c2395d.pdf
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/288b2fc.pdf
    • https://cdn-cms.f-static.net/uploads/4383572/normal_60309c67b314a.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_60387d554062d.pdf
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fccf78eca482.pdf
    • https://static.s123-cdn-static.com/uploads/4478927/normal_600580660cf5f.pdf
    • https://cdn-cms.f-static.net/uploads/4420448/normal_6032f8415094f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_a1ac6273a6674bf6aef69100761f6029.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_ff4f8636becf4393a99be1241b056840.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_d2242bbfe9e34892b32bb850110483cd.pdf?index=true
    • https://s3.amazonaws.com/wegemebufojafak/9516311819.pdf
    • https://s3.amazonaws.com/befarekogol/chinese_visa_form_india.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_da4bc0411a674988bad41a00299e3996.pdf?index=true
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_30b7c84f175147bca47313affe3d4fa5.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_13e851f53e424a4e85fd29adde29bc9f.pdf?index=true
    • https://s3.amazonaws.com/norozovijalu/gelalawirimasijomutujiv.pdf
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_951edbe777b4415986679d0ca1d05652.pdf?index=true
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_b30bac51849b47a59cda218a8454eda3.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b7.bin
07612f4ba27a7f769e79c4c4cad9ac76458b9f8297df6ad487d42e1ab25b0500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 5860 bytes
font_01_sfnt_off00012b7f.bin
ac31aa2f4f73f7fd5a7d6fac659023db3313e2ec5d2494a4adcbbb78e99f9baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7F 11536 bytes

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