Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c96957327493e40…

MALICIOUS

PDF

78.9 KB Created: 2021-04-28 04:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f22edb20aa84d08252fbf796288179b2 SHA-1: b7396b777273d1119f959182ad414e6a9b2841f5 SHA-256: 5c96957327493e40dbe2fcbfb5616b353499b610483387aaabc56294c5004078
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to a redirector URL (https://jumiwimov.ru/strik?utm_term=what+does+nearest+tenth+of+a+foot+mean). This behavior is indicative of a link farm or phishing lure designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/strik?utm_term=what+does+nearest+tenth+of+a+foot+mean PDF link annotation
    • https://nosobafib.weebly.com/uploads/1/3/1/4/131438228/fizem.pdfIn PDF document text
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/8718088.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/7163169.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/bf624ecf-c489-47ea-9803-efdd0bfaa3a4/viteg.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/camera_access_plus_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10e2a8d-1b0d-4b8a-a976-35ba6a82ee1b/kugob.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/suzaremazapudi.pdfIn PDF document text
    • https://f270a619-8d23-4dc9-95fa-a4320df4b75e.filesusr.com/ugd/7bd364_6f36240b1e0c41a8b0afc42599c6ff77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/sales_funnel_book.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/zimurabuvilujazen.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/video_poker_hands_cheat_sheet.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_7dc2059c39164801abae3f7ca0cfd741.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_85ac9bac414e4c79848e3338c1fb9449.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_2d3f6b4d1bba41568268f152b4b7a0d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/34103289420.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/chrome_network_tab_response_format_json.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_bebcc6a973854c0b9aab36bd6897e409.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/43767274013.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/algebra_1_unit_5_test_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012bf963-d815-43f0-a9d8-360dc910f57d/33746731446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e814491-d405-4f33-9ee0-3e44d03675bf/counseling_the_culturally_diverse_7th_edition.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_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 5128 bytes
SHA-256: 8193e3d645a49c9187052866a87b2cce52959e3ff6c10c239cfab8c0570610ef
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11020 bytes
SHA-256: 1b2fa53cf83fe3cd6c1644f89bf07e445dc1590965e687738fbceba7b8efa429