Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc88f88c055928b…

MALICIOUS

PDF

79.9 KB Created: 2021-05-11 13:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a09e2863ff75bbab2dcaf8f6e5cd76c3 SHA-1: 05a91cfe038e054db0e0f1e19c61e8a165cb7577 SHA-256: 9bc88f88c055928baa9a632d7303e6100570c07cfa7767fea556e2465f12a3a8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs suggests the primary function is to redirect users to potentially malicious content.

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://ponafet.ru/strik?utm_term=2005+dodge+grand+caravan+transmission+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fdabcc8836a8.pdfIn PDF document text
    • https://borojiwanap.weebly.com/uploads/1/3/4/2/134235821/toparop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_606dc4793b875.pdfIn PDF document text
    • https://wexokoxenasebun.weebly.com/uploads/1/3/1/4/131406289/8decb391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fd8f6c86f5ef.pdfIn PDF document text
    • https://darenufu.weebly.com/uploads/1/3/1/4/131438483/3143202.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/womujob.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/6579010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_6037ccd6ac7dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fc612f83db0b.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/iefifjj/xukaxow.pdfIn PDF document text
    • https://cdn.sqhk.co/wubofuse/gh2ghge/engineering_in_life_sciences_journal_abbreviation.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://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_3768c61839284339be9b3b99b7c2daf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/rise_of_kingdoms_ios.pdfIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_7e4aa75394f34c589cd36c3f59676b03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/sezojidufojakunebunov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5298f4d-e7a3-4911-830d-849755f6e2d1/behringer_inuke_nu6000_for_sale.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_0cb820b2d2424b4aa4d87f80f8010fc5.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_7d8387d35d2248d6bc9b6f4e2d95a396.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d6dd85-9716-430d-b3cc-d9bc6d4c58a9/modern_romance_audiobook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/making_a_fly_fishing_rod.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_3d3617a278294f069a37d9262b4b5abb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/wufij.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 5684 bytes
SHA-256: 0d181377be96adb53c9a5484a1f459edea182025193e59fcd8e9ab88c576cee6
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 10536 bytes
SHA-256: f18d8375840d67e437e48838a73cfc6afeedf2698fe3cbbe576ca011434c2ca0
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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