Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0a482e44b5ecdd…

MALICIOUS

PDF

117.8 KB Created: 2020-11-25 09:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: db35b0caabee70eddbff118f04060145 SHA-1: d8a8c388ec93e7638781dba708ab2a27a8fe289e SHA-256: 1b0a482e44b5ecddb6deeaf9a7c08980211e3960147835ac076ebfb72cc8d853
156 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 0.9996

Heuristics 5

  • 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.
  • 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://trafffi.ru/strik?utm_term=k+c4+kilauea+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5fa19cef63a2f.pdfIn PDF document text
    • https://lapenemelibi.weebly.com/uploads/1/3/4/7/134708636/9804480.pdfIn PDF document text
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/lejuguwegir-fumelusenopiv-pavebaba.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/wavafoz_boluxifojat_zexojalopukekid_nexebikowevop.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/rixuweburajatogoxon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_5fb823bea987b.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/3356518.pdfIn PDF document text
    • https://jazetixi.weebly.com/uploads/1/3/4/4/134494542/217b2e42ef61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_5fb5bf4cd9f3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxadol/jivusopewenowosagifubata.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/88441244528.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/778773035.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/3_day_refresh_program_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/tecnologia_da_informacao_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/acknowledgement_for_a_report.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_off0001851c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851C 2960 bytes
SHA-256: a4eee3438a7246650f0a21218a9bc29d7bc7bf1b287bce9df301f714692068dd
font_01_sfnt_off00018fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FA0 4640 bytes
SHA-256: e3f6eb0438e6d413b89dc876f44d0da55b19de0baac5da925bdf2b48ddfe9e6f
font_02_sfnt_off00019f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F88 12336 bytes
SHA-256: 8fe16e91fa55afed0d82af89adae23c98ef93b4a9b751b96b6fa48d640962a3d

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