Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edbbdfcceb72cfa…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 16:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a2c5944688e03ecdceb3d4fed023b56 SHA-1: c66e2d09f425c2e0956c76efd0a505ed4891fe79 SHA-256: 6edbbdfcceb72cfab21149360e4186499d87a2145583e7dde4de591e78af3445
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-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://crophysi.ru/award?keyword=factors+influencing+buying+behaviour+pdf PDF link annotation
    • http://rejasepilibuxep.iblogger.org/budifiluzugejove.pdfIn PDF document text
    • https://cdn.sqhk.co/furabafezuse/vifhdgA/cheap_halloween_contacts_near_me.pdfIn PDF document text
    • http://davizaxokekibe.iblogger.org/11350065148.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/feHjfqZ/warpath_jurassic_park_ps1_cheats.pdfIn PDF document text
    • http://tirevuvezig.22web.org/birds_encyclopedia_with_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/cgfvjdp/ethnically_diverse_in_a_sentence.pdfIn PDF document text
    • http://getinugalukef.iblogger.org/equations_of_motion_in_relativistic_gravity.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/eibgigf/voice_recorder_download_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/elder_scrolls_oblivion_alchemy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d857541f-f8fe-412a-ab98-8c5d579aab78/vegomuligaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f133d4-856a-43d5-94d7-f63592dc99b6/which_is_better_roku_premiere_or_amazon_fire_stick.pdfIn PDF document text
    • http://wivovazu.epizy.com/solidworks_flow_simulation_2020_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/taco_bell_fiesta_taco_salad_carb_count.pdfIn PDF document text
    • http://guwitus.epizy.com/ireport_no_encuentra_java._exe.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_26dbfae41a1140ad839b47440738fa2b.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_e1df247773664ed1a573ec4e6c70245f.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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 5672 bytes
SHA-256: 91953c5826eb3a2be46acf49d359f6f5d802dc092467c231a18f837b578b3fc0
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11164 bytes
SHA-256: 4508e0598fbb2c5d0a926cdf84d2797f4787f263ece586d5161e46c80ee69c0a

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