Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3672a717e22e010…

MALICIOUS

PDF

76.5 KB Created: 2021-02-15 16:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: faf8c8ac13038e886e825b992a00a5ab SHA-1: ea9fa13a290a768b2485334c030957ffeaf86b2e SHA-256: e3672a717e22e010111f14e3c63a0a845aecd586493ea8969bf68d25ba6f89ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this purpose. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or content distribution mechanism. No scripts were extracted, but the structure points to a malicious document intended to lure users to external sites.

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://seumenha.ru/wix?keyword=ffxiv+sour+red PDF link annotation
    • https://cdn.sqhk.co/bebomopakax/fVjdijq/free_savings_tracker_app.pdfIn PDF document text
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/dejezemuwugo_nexuxanoku.pdfIn PDF document text
    • http://remontnatali.ru/honeywell_barcode_scanner_1250g_manual9fg3n.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/worudorekej.pdfIn PDF document text
    • https://wurudejokifar.weebly.com/uploads/1/3/0/7/130776262/4838223.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/3073076.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/momubutedu.pdfIn PDF document text
    • http://limons.space/beautiful_star_of_bethlehem_sheet_musicirr55.pdfIn PDF document text
    • http://nububezobuto.22web.org/dawaxelixuragoju.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/fofojopim-tugox.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/6172a22b.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/bgffibP/50858097826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevixogojo.epizy.com/4735682269.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/98441171617.pdfIn PDF document text
    • http://dorediludopa.epizy.com/kettlebell_workout_book.pdfIn PDF document text
    • http://ninovaxabax.epizy.com/deliremufikija.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/ribasokinakudesupadoja.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/nepaji.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_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 4744 bytes
SHA-256: c8328b6760dd7cd88197721a0e0bd1fe5d060f6035b0117890c6bc68e5399728
font_01_sfnt_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 14956 bytes
SHA-256: d10790d2b2114c6216e54529947afc38088a39a25d542aabdcc67f8e790943c4
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16084 bytes
SHA-256: 7851fffef52e473cda661ca30cfe3df526f3fed1248a67fb10825064e0e4480f

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