Malicious PDF — malware analysis report

Static analysis result for SHA-256 963cc7afd33f8350…

MALICIOUS

PDF

87.5 KB Created: 2021-04-05 12:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5de7dbaeade95e3f3bd79ce9304d32ae SHA-1: 94618bc3b54a2c6e55141cb0bcd7b217b94235d1 SHA-256: 963cc7afd33f8350c3305d3d7e8e58136811bff7be328226f025108f519c06fa
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to exploit users by redirecting them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://golowaki.ru/strik?utm_term=firex+smoke+detector+manual+i4618 PDF link annotation
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/foxozawexebexuj-pixezikodo-vijonamagi-pizigukiboka.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/vomedozabix_lunoruvumok_wexiferogixavin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fcbe2054e787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_6050cb8f9cba7.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/4148413.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/metric_bolt_sizes_chart.pdfIn PDF document text
    • https://totapige.weebly.com/uploads/1/3/1/4/131483287/da3b7c46858.pdfIn PDF document text
    • http://hdsamara.ru/4878646576537eg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd071582886c.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/88904648658.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/9067596.pdfIn PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/wasow.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/2779538495ff977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_600dec1f6ae05.pdfIn PDF document text
    • http://hookup671.site/technivorm_moccamaster_59691_kb_reviewdjzue.pdfIn PDF document text
    • https://pusurezifokuni.weebly.com/uploads/1/3/4/3/134317864/bigokes.pdfIn PDF document text
    • https://tokajufifed.weebly.com/uploads/1/3/0/7/130775528/6240642.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/022f3769b7dca8.pdfIn PDF document text
    • http://vafojonigovav.iblogger.org/exercises_on_simple_present_tense_for_beginners.pdfIn PDF document text
    • http://datingsexchat.site/sample_essay_using_apa_format7txor.pdfIn PDF document text
    • http://kelnoteres.xyz/penodemexixulusokegifade0phar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suzekusopowe.epizy.com/kapitan_sino_bob_ong_free_download.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/hsfpp_answer_keys.pdfIn PDF document text
    • http://baminitase.epizy.com/definicion_del_sindrome_de_asperger.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 5660 bytes
SHA-256: 22c476e00737bf0abd522eac29b9d3fd33ea35be2e43283b11d6e4ca2ab3667c
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 10916 bytes
SHA-256: 52e41cbf88128b4d7d507bebe98660971c5878a08c8f634c6edbccbbf7b6ab25
font_02_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d