Malicious PDF — malware analysis report

Static analysis result for SHA-256 3962be2faceadb34…

MALICIOUS

PDF

72.5 KB Created: 2021-04-08 23:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51c8336a92a44bd77fd90582e67bba9b SHA-1: 75c1e4d0b9a9c276dac28a8b59b793beece10840 SHA-256: 3962be2faceadb3433447e8666d8f8f5c02680b6b36cfd4e7d117ca032c8fc53
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=public+policy+alternatives+definition PDF link annotation
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/e1d60.pdfIn PDF document text
    • http://priz24.site/thomas_calculus_2_trke99gra.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/honeywell_1300g-2_barcode_scanner_manual.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/78908982467.pdfIn PDF document text
    • http://jifosorov.22web.org/53074107272.pdfIn PDF document text
    • http://esmoney.site/formaldehyde_safety_data_sheet_ukt06b7.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/xomakugederovaj-dimepumupit.pdfIn PDF document text
    • http://helpcontactform.com/twitter_old_version_apk_mirrorpyg2q.pdfIn PDF document text
    • https://foxodutamawasu.weebly.com/uploads/1/3/4/5/134587344/21fdc1f61bca4.pdfIn PDF document text
    • http://tevfikyuce.xyz/13212900602rhbm4.pdfIn PDF document text
    • http://frasqen.online/408238395jf7pw.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/61385563277.pdfIn PDF document text
    • http://tevezeraxekuge.22web.org/classical_mythology_powell_8th_edition.pdfIn PDF document text
    • http://gallery-shop.site/perdido_street_station_artgl2q9.pdfIn PDF document text
    • http://healthytrands.com/promissory_note_template_california_wordazz7r.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/8732543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_8225e759cdf54d37b7be80569c1fe50d.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_7339c54de7f34076b534e4666f70d37e.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_59207cb16ecd4bec8eafd223b282e78d.pdf?index=trueIn PDF document text
    • http://kegigija.atwebpages.com/anorexia_nervosa.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_f9570fd76b67473bbc8a934ceeef4ba8.pdf?index=trueIn PDF document text
    • http://pulejebolev.rf.gd/deductive_teaching_method.pdfIn PDF document text
    • http://molegidotisi.rf.gd/vesagigum.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/andante_andante_sheet_music_free.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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 5452 bytes
SHA-256: 3e6fd3aeb5e921977c5c48d9bf0cca67f560d9e61b870b52911db5da9c75f545
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 10400 bytes
SHA-256: a4c4b9a64034a50a7053b7af7b65cd81761555fcb3a44fef7b0256c98cbb189f