Malicious PDF — malware analysis report

Static analysis result for SHA-256 9404f72e2b22e96d…

MALICIOUS

PDF

84.6 KB Created: 2021-05-18 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f1de523ee0a6d16bbe223e41bfdb4f39 SHA-1: db201600157ae73a32c5a9a24aa833fc74b5b126 SHA-256: 9404f72e2b22e96d3a42437f53c208fa34d78c1b68ac4d162833f8b36d8d6c05
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 0.9996

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://xezojetit.ru/strik?utm_term=6+in+1+ultrasonic+cavitation+machine+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375352/normal_603e94a4b3415.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/buxemojumedixipinenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_603255d745706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_605da80ada175.pdfIn PDF document text
    • https://gilaniluju.weebly.com/uploads/1/3/5/3/135386901/divelotulikoleb_tomosa_zatirawulalojuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ffda8d7d3f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60107aa1bca7f.pdfIn PDF document text
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/7979926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_5fcd522e376a1.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/eb09a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kamuvojev.epizy.com/gta_san_andreas_cheats_file_free_download.pdfIn PDF document text
    • http://kijolitenelofon.epizy.com/curso_de_ingles_para_nios_disney.pdfIn PDF document text
    • http://papewemejivore.rf.gd/savabojinasexaribe.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000120ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120AE 20844 bytes
SHA-256: 41639d01fba7090e1fd7b3b365fbecb7097a7989636d6a99d025bce8214e93bb
font_00_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 2960 bytes
SHA-256: 495dc75d95a6a6f45ac0640accda880cdd7226211fb355277ff836c691f61857
font_01_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 5208 bytes
SHA-256: 9c684dbcff06e5cd7a72ab8632abbc638c69c9ad0083dd86cda9866d16b5868e
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 13032 bytes
SHA-256: 6e1bf54d60a2242008bcdf3fb7fcf6a5a373f405fd3885012d7db0e3603714d5

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