Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c59f1ecab65378…

MALICIOUS

PDF

88.8 KB Created: 2021-02-05 18:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 956159b217443b43a77f4f3a3bd9c911 SHA-1: e8ffbf8e2c35220029646871381cdf7bc18b6cab SHA-256: c4c59f1ecab653785050c0c9b7258000f8907791e307ec49f903e0601405172d
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 or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection scheme, likely leveraging embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wb?keyword=aggregate%20demand%20and%20supply%20macroeconomics%20pdf PDF link annotation
    • http://fozovozazu.iblogger.org/bounce_tales_nokia_mod_apk.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/845fbb39f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fd62c29da25e.pdfIn PDF document text
    • https://rosivitowa.weebly.com/uploads/1/3/4/5/134590356/gakovesixixadago.pdfIn PDF document text
    • https://togurugake.weebly.com/uploads/1/3/1/4/131412858/durafivejepesaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_60047e5b80022.pdfIn PDF document text
    • http://lewodazegozi.iblogger.org/adjectives_worksheet_for_grade_3.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/birag.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/medurevijenip.pdfIn PDF document text
    • https://mapokelamoda.weebly.com/uploads/1/3/1/8/131856574/dopodejidun_sigubup_pukixokopadoxot_munavale.pdfIn PDF document text
    • https://jirozonuk.weebly.com/uploads/1/3/1/6/131606844/d5a0881.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/6103475.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/foniselitowobu_lusidedeniguful_xijerujedef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugidujesu.epizy.com/awadhesh_premi_dj_song_video_3gp.pdfIn PDF document text
    • http://negavutagogo.epizy.com/vananebusazoniwogode.pdfIn PDF document text
    • http://xasonivuk.epizy.com/dorenapelij.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_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 5564 bytes
SHA-256: 78b8944bf614c19bb0cdf36e60c17511d2e5dab77af26f742e37d456d3542083
font_01_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 11900 bytes
SHA-256: 3c59e66713ff2c73a552269980a3a8463065766fb83ba825545adfc9456fa30f

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