Malicious PDF — malware analysis report

Static analysis result for SHA-256 587842fed9f80154…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 05:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aa8ac5bd18f2fafe6e849b2aa36c4622 SHA-1: 0f29664ba23c9f26216788746a6543776446dbf8 SHA-256: 587842fed9f80154dc10f359502fdf096a2324123ca8688449c59f5c4ecc3d8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as part of a link farm, directing users to external URLs under the guise of providing information on social networking skills. The presence of numerous external links, many hosted on disposable domains, suggests a phishing or spam campaign aimed at driving traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=how+to+improve+your+social+networking+skills PDF link annotation
    • https://mirovufi.weebly.com/uploads/1/3/5/9/135958785/tabebutidutin.pdfIn PDF document text
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/serudedipeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5fe5d439d4010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_60132fd731c4a.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/9facd042bf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff79d200cb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_605053761d83f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_4b2e9f3476074ff1bb3a1e2d50274760.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee3b9c1-37aa-4a2c-b9c7-be5c27720cce/ripamuvegosixafuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82a5b7d-6d33-4637-b807-cd538abcd7e4/ado.net_4.5_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/98474962641.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_1adee2c6640a4a15b9bcf8f0466ff856.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/ap_art_history_islamic_art_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/16230097104.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_57490715d9844a26b5ed7a874f559b21.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_da73f73b00654287b3923c2d9c2d8147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28421b0c-0412-4023-82bf-0fbad4613d07/dewalt_pressure_washer_3600_psi_no_pressure.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_ae30db517c6943e3898eda451daf4ba8.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_48019261a0524bbb8e34342792cadc1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/19587255433.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/nawomotil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b793f3-c606-42e0-99b3-ec63252f74c1/what_size_tires_go_on_a_toyota_camry.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_45ea946c52034facbf79f6888d83e5e6.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_9dc8bb825f0c48f9b1e6e4364e772842.pdf?index=trueIn 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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 5532 bytes
SHA-256: 8eac0f9f80e7f09c060976a4a7b12bb90d104b1a6a8b868cdc79051422575ad4
font_01_sfnt_off00010bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 11236 bytes
SHA-256: 78f1cf7125042aa23dcf559dc8213ef5ef164528b04fd5bf56aef49a57c6b0f9

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