Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b53f7330912df13…

MALICIOUS

PDF

103.0 KB Created: 2021-04-06 05:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: db3251b38e402763b9781f9935d7e86c SHA-1: 21e562757d465fba69f09ccdae21a5d537f0feb1 SHA-256: 3b53f7330912df132cfa61ad5889a5153a672217c0391ac4c10d295fba0bd4e2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or ad fraud scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nipisod.ru/strik?utm_term=what+is+meaning+of+public+administration+in+marathi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402720/normal_602ffbd1aebe3.pdfIn PDF document text
    • http://vorecan.space/5_ejemplos_de_realismo_magico_en_como_agua_para_chocolate5ddwj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_605d923aa1c61.pdfIn PDF document text
    • http://50offshop.info/zoniluwaxekeeu0hr.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/mawiravedoti-goxesapipupolo.pdfIn PDF document text
    • http://meetchambre.xyz/zogizizodgs4fk.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/xotubibosedoxin.pdfIn PDF document text
    • http://edarudost.online/twinkle_twinkle_little_star_trumpet_sheet_musicgc8oz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6031680446f0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fcd33bf32aca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418199/normal_60025eddc94b1.pdfIn PDF document text
    • http://frasqen.online/langston_hughes_harlem_analysisysqtb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_60252a6586fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_603c79a57e354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_602c064413ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_6025e619a71d1.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/furivalawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5fcf6a26840f8.pdfIn PDF document text
    • http://quickpapp.online/sample_case_brief_format_law_schoolhel0l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_637b02a6551647c7b43d4dab32d333d7.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_f712c1c7a67046b39da3cd57db00cdce.pdf?index=trueIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_e0c37b0a68ee4c4f8f52c42b68990609.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_93cf5815bb5e483586db34ec3fd2a46b.pdf?index=trueIn 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_off0001570b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570B 5724 bytes
SHA-256: 462f15d10d1025e814dc7f905ef712a392292b0950e3f244db97866640583001
font_01_sfnt_off00016a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A60 10384 bytes
SHA-256: cd6241f6905f9e54d42aadaecf1987151d7e5580e052c62ed39669f549777b38