Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde7c1798854df1…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9b0eede90b28935ab40f108f59b4984 SHA-1: 93adb10d9d9eb0554aaeae568d37728d23fab90b SHA-256: 9cde7c1798854df19c39d284d068b0f6bfeeaae3f1bf08dd3fadd9f25ad40c82
186 Risk Score

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=honeywell+quietset+tower+fan+with+remote+control PDF link annotation
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/musazi.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/58cafda76948e.pdfIn PDF document text
    • https://zevigutuxokalu.weebly.com/uploads/1/3/4/7/134769804/977644.pdfIn PDF document text
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/fufekul.pdfIn PDF document text
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/mixejafo.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/vuxuk.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/feguliroz.pdfIn PDF document text
    • http://giftcard-sale.store/sled_driver_brian_shul5eqpy.pdfIn PDF document text
    • http://moscowflowers.online/chick_fil_a_starting_wage_20198laje.pdfIn PDF document text
    • https://tewawizibix.weebly.com/uploads/1/3/5/3/135347661/bezapopikub.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/9af697e.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/55d37fd4.pdfIn PDF document text
    • http://prechambre.xyz/27501152964owe8y.pdfIn PDF document text
    • https://wifivarar.weebly.com/uploads/1/3/4/8/134887990/e36f8ed1044.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/volijupepejija-retaxotawofade-xiredole.pdfIn PDF document text
    • http://successinyourlif.website/tatokorelaadgy5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_5fa87b7131ec4a6a9d45bfe48d3b3283.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_33914dadc5c040f6b3882b53feac306e.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_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 5400 bytes
SHA-256: 041eb0e3f8c95bb70666ec82a15c43210ecf366edc76b7428b6f480f0233a4c8
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11008 bytes
SHA-256: 7cf1a5cbecb7299c7723a8ae19ac0af69fd58db70b77451cb60232d48e38773a

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