Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb3e7e3efaeaaf9…

MALICIOUS

PDF

88.6 KB Created: 2021-04-26 16:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c1208a33ae78e22304497f4bb3b754d6 SHA-1: 8906fc9f7f301f4455ad4b3024051874ab7938be SHA-256: 1bb3e7e3efaeaaf94937d96935e309215496285e0bedfafa5748bc63c129a387
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 0.9997

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://dugedepap.ru/strik?utm_term=how+many+pages+does+east+of+eden+have PDF link annotation
    • http://christmas-gift.ru/buludulojovekaglxc8.pdfIn PDF document text
    • http://callipakk2.site/52908607039hdvwz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414342/normal_5fff57151ec0d.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/dedutenomazonodomijasi.pdfIn PDF document text
    • https://dowixedazu.weebly.com/uploads/1/3/1/4/131409709/wamudogerokiwotilede.pdfIn PDF document text
    • https://nizerekudoni.weebly.com/uploads/1/3/5/3/135383630/jutolakixu-govopetuwim.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/sims_3_super_patch_mac.pdfIn PDF document text
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/rizedepemud.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/annexed_book.pdfIn PDF document text
    • http://wisecredit.info/86421022663re0v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_601c9bf05a519.pdfIn PDF document text
    • https://taxupolejunak.weebly.com/uploads/1/3/4/6/134663048/dbda965ca001.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/45c967dc-1c70-4d01-a493-75e053c2b0eb/niwurixemoxigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3aad92-8bf3-4e4e-a64d-a4b90aa36b81/virusajemelox.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/19526167168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9990d9d7-1fa1-4079-b5bb-ab193ef7264a/25995434294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dbad67-62fe-4c69-9c18-27fa821856ee/d-link_dir-655_firmware_dd-wrt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcecd19f-9106-4d29-b263-c79c6c0b544a/sizujesabete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b904cdf3-689f-443d-95d8-cf41b283cc8e/how_to_clean_samsung_dishwasher_dw80j3020us.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_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 5540 bytes
SHA-256: 3239feed871b6145e3b8647f7537a12edc646f8da45a41f62055fada2d41971b
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 10684 bytes
SHA-256: 27739a4a0997ee05efe174a45284dde033a352135779ccf3d23789f4c9c9691e
font_02_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 16116 bytes
SHA-256: 32ed552f28c08e6da84c6f9a06221233fd0d7dc1daadb77662ac87960b838a5a

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