Malicious PDF — malware analysis report

Static analysis result for SHA-256 517a0c8b036f1bf5…

MALICIOUS

PDF

96.9 KB Created: 2021-04-06 06:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 32c8ce3d0aee7222ef8efb6c36329c2c SHA-1: 797fbaf58b224c38a25b0c28fe20b39cdc865644 SHA-256: 517a0c8b036f1bf56f19f13b82eeda00aa1f5924dc2f35e4299da4893a3d087a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The presence of multiple disposable domains and the ML classifier flagging the PDF as malicious strongly suggest a malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://ponafet.ru/award?keyword=holy+bible+catholic+pdf PDF link annotation
    • http://idealica-co.site/22495261523amkfc.pdfIn PDF document text
    • https://zogabugopevaluz.weebly.com/uploads/1/3/0/8/130814784/2050640.pdfIn PDF document text
    • http://spacexfoundation.net/81788730994q2uo3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_603b95dbecaad.pdfIn PDF document text
    • http://healthytrands.com/857986399914gpxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_604e2a5350576.pdfIn PDF document text
    • http://trend-sales.fun/cant_help_falling_in_love_chords_guitaleleai1ok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475216/normal_60450d901c263.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/4852113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fd8f5f530eae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483589/normal_5fde629958013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5fcd0ce14ad67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fe3e4f05df90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505771/normal_600c9f6f40f68.pdfIn PDF document text
    • http://extrameets.fun/mejun88yoq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381090/normal_602593492b7ee.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/kovibu/praveen_sap_sd_training_material_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/5746925393.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/zetetojodukojin.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/defumenunulomi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 5172 bytes
SHA-256: 07a988d41a534a27101e075c55d8056567aa2245a7f66dfb05347b4ff0d77173
font_01_sfnt_off00013947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13947 12260 bytes
SHA-256: bca0e84c72bdaa5d7348067ebc9674a605cf3d99b812bdc9438bd5e601de8f69
font_02_sfnt_off00016202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16202 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940