Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cb8635a3fbafa2…

MALICIOUS

PDF

66.6 KB Created: 2020-12-09 12:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: acfe50223d448ec474e4c1e1f1378223 SHA-1: 18c17e43b46bb53e76eeebfe599ce970aeebfcf5 SHA-256: c9cb8635a3fbafa2ef111b46d5546809edc6834155702c5f708137474bb192ed
186 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 0.9998

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://trafficel.ru/123?utm_term=95+jeep+grand+cherokee+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5fb7a5c838ce3.pdfIn PDF document text
    • https://wajodaxomunav.weebly.com/uploads/1/3/4/6/134625674/c9c9f9e8b8ac.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/3261962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fbdfdae6b090.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/5717053.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/mixag_megeb.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/wevisukofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0de06e4-1780-4ee7-b09b-c936c853547f/85265232640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc214d09-6bf3-40c6-b269-7dbf9033d493/the_remote_device_wont_accept_the_connection_vpn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d172e5-feb2-40b8-954e-1aeb4c0d701f/44669838410.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6783427a199023adb956e/t/5fce73f686458902ebb6ce42/1607365623241/drop_g_smash_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074d7311-abfd-4565-846a-c6b2ab12fe17/strike_force_heroes_2_arcadeprehacks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9127df3e-1f17-4c50-9fd0-e562c895a325/animal_babies_names_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6598f2cf09257bd909251/t/5fcd95b7a87f9f1b19f3d816/1607308727641/14359244354.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 5740 bytes
SHA-256: 8cf5e6045a54df1246691c3110aad40925d846731ad8b61241bfd45fd1689e91
font_01_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10436 bytes
SHA-256: b40556158abec6dc104126621ed9bc8370157016be9de09322c034eb0050c007

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