Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8021690f5b1cca…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 03:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aff700daf575f400b5b02bcb2d78a8d0 SHA-1: e157e489f5d787ba569e944b78c7e073cca622b7 SHA-256: 7d8021690f5b1ccabf406e0ff283d1d1905957953ec9af06fa689dd15241b909
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL `https://xajibur.ru/strik?utm_term=artist+management+for+the+music+business+paul+allen+pdf` is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=artist+management+for+the+music+business+paul+allen+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372955/normal_6016351238b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_6050ed7745e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_603782275acdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_603143b1cae75.pdfIn PDF document text
    • http://zarabatyivat.ru/6383089587534trh.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/6105793.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_5ffdc373678bb.pdfIn PDF document text
    • http://zelopaqq.xyz/why_my_acer_laptop_keyboard_is_not_working_properlyq7wao.pdfIn PDF document text
    • http://naturalgood.space/rode_videomic_pro_reviewjmzdf.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/c40d3ad.pdfIn PDF document text
    • http://canlisohbetim.net/big_data_analysis_companies_in_indiac5t90.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/e7c6bf10-3ab7-4251-8727-161292dbe1f0/what_is_the_two_longest_rivers_in_the_united_states.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d809975ed7a84941bb440c872f635218.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85689522-9bad-4c66-9f0f-13a5c5c7cd1b/meaning_of_stairway_to_heaven_yahoo.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_ac91d6a633754bac82b65002e6e52335.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cefe3e-451c-45ee-9d5d-cb65f7d747e7/graco_solano_crib_with_drawer_instructions.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_83abbc0502774528a3970341bbd89c8c.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_d7fec4a312e041a2b675b51a33c7d22b.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ce0895244f4a4c4b89804b05e083ed97.pdf?index=trueIn PDF document text
    • http://nanabiwilave.epizy.com/action_verb_worksheet_high_school.pdfIn PDF document text
    • http://nimesirasono.rf.gd/guide_michelin_2018_restaurant_lyon.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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 5700 bytes
SHA-256: 42aaecb31fdffd2d97b79164932142fa6b199a8fa45a05f6ad75d20956ef6671
font_01_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 10716 bytes
SHA-256: c20ddafb8e1e321e9faee5ef9fb96303b925e68c3353f9b59d723efa4ec21c7b