Malicious PDF — malware analysis report

Static analysis result for SHA-256 037f8f53995d199b…

MALICIOUS

PDF

77.1 KB Created: 2021-05-17 14:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4555a8db9d1665a42a9c70ea475c28c8 SHA-1: 12e33ed0fa6677a7657c8cdcc71168cbaf47084c SHA-256: 037f8f53995d199b1084aa7a60c7bf8f681d015de6201fad9bec61e5b19cd94c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=2nd+grade+math+word+problems+book PDF link annotation
    • http://minosijasif.mypressonline.com/accounts_receivable_turnover_ratio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6011721678e53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_600648628703e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415055/normal_5ffe64b2a0ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_6031ee6cba06b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_603044fa8a16f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc7429f10b27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_5fe6dc8d49546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_5fd2d245e3114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_606a0188d17e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_9914e0f4f8bd4ac69c7568c3ca8b92eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/edison_report_kevin_poyck.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_6c777c8f19ed41d49e3a78fe9de4dda8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/49447839173.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_98d6ec7b7fbc4cd59afe1059f3ccf63d.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_7e9e769f46cd425d9aa4825b23145b98.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_2ff11d74aadd4f4fb7416df8529e6114.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_5fbede81f0ea4a4e9a44e637499d6030.pdf?index=trueIn PDF document text
    • http://moxapowi.myartsonline.com/93306238302.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/ao_smith_water_heater_parts_manual.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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 5708 bytes
SHA-256: c1b41cc1821196376c704d23ca092df09a572aa55c5a640be48284c205d11eba
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11032 bytes
SHA-256: e5ba208377316c0e6bf5714d59be11634582b28dd39482b3c12aa32a98aa4a38

Open this report in the interactive analyzer, or submit your own file for analysis.