Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0d0d7ec4f932f6…

MALICIOUS

PDF

82.1 KB Created: 2021-03-31 09:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 58bf6751f5af32b9bd9e68153fc27639 SHA-1: 5a9bbd39561a3662c17628316e1313f5cb4b63f3 SHA-256: 6e0d0d7ec4f932f6dfa71acd68063685a8091d52034751b5230bae504b4198f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://crophysi.ru/award?keyword=how+to+cite+a+pdf+book+purdue+owl PDF link annotation
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/fadc70584e.pdfIn PDF document text
    • https://kisetujetu.weebly.com/uploads/1/3/2/8/132814277/dopelusokep-ketujalarixur-bisonubobozip.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/master_of_the_universe_castle_grayskull.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/bash_script_if_else_string.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411932/normal_5fcea2601e888.pdfIn PDF document text
    • https://xoxitugupara.weebly.com/uploads/1/3/1/3/131383959/nuloteguwo.pdfIn PDF document text
    • https://sovejugi.weebly.com/uploads/1/3/4/6/134652237/1ff7bee70cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_6040181b60a91.pdfIn PDF document text
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/d35a37.pdfIn PDF document text
    • https://fumuradowije.weebly.com/uploads/1/3/0/7/130739974/7368900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455681/normal_600c03e2cdbb1.pdfIn PDF document text
    • https://gusagipo.weebly.com/uploads/1/3/4/0/134017144/poxipiziroti.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/05fd55cbb6507.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/mosereporajor_wugewobemubima.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/56292489-4009-4313-b9b3-d89006ea9b9e/how_to_reset_dlink_dir_825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f03d8e4-5c51-4bdb-b2f2-d4ee4a32ec1a/lejevagumukifomutiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d3e841-d431-4a94-bce8-bccaca511185/why_does_my_samsung_freezer_not_freeze.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_off00010243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 5228 bytes
SHA-256: a6ff726d15ad32e8267f2e47482da84dadca5b285f8d1b199ff767704fab0920
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 11600 bytes
SHA-256: 01206b285302b5bd424b2ea013dc7e95babf5770436ecc886467968b283f2267

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