Malicious PDF — malware analysis report

Static analysis result for SHA-256 825767e0c44cb6f6…

MALICIOUS

PDF

70.9 KB Created: 2021-02-20 20:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 67891e64d2f8e50af14a38e084d9ff33 SHA-1: c79a4a4000dc062828d986714d831e90f61b6b1c SHA-256: 825767e0c44cb6f68d1adb58cfb54353acd6731974c99facfd3ff69ef5349580
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/wix?keyword=mathematical+statistics+with+applications+solution+manual In PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/d8c01a3e0b9.pdfIn PDF document text
    • https://cdn.sqhk.co/vimitewimuwi/ihggifQ/legononekiruw.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/ijyBZYR/86392750190.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fc69c6bed86f.pdfIn PDF document text
    • http://familyit.info/faux_leather_sheets_for_bows_ukmmzez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5fd18e41b7bf4.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/gdUZwhd/hot_wheels_ultimate_garage_instructions_shark.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/he4FggM/used_cars_for_sale_by_owner_under_10000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_601b8cc2a4f01.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/ZjeNghc/kosot.pdfIn PDF document text
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/9721715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/butevila.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 5056 bytes
SHA-256: 0b6118474ed5d5edb1c0c96eb7a5ee288200dea20e9bd8bf9b13cadd27c66a40
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 9952 bytes
SHA-256: ffca09aa8a587291cfa52e40f011051f83ce4156afa06412a1528e81d10e87cd
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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