Malicious PDF — malware analysis report

Static analysis result for SHA-256 923bd293e50b986c…

MALICIOUS

PDF

141.0 KB Created: 2021-03-21 05:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c497fd680aa0f5258fcda637f10633a SHA-1: 113de97f73810460c95f9c25732f02e419f832f7 SHA-256: 923bd293e50b986c6a9de12044e4771a881c8bdac20d87b00625355155e321c9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that uses an image lure to redirect users to a phishing site, disguised as a free download for an academic document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or exploit. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://fokemale.ru/award?keyword=calculus+1+pdf+11th+edition PDF link annotation
    • https://cdn.sqhk.co/nemazuwigumo/2JFhbhf/mozaik_portail_csdgs_enseignant.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/36550073431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366384/normal_5fff3a6c45d30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fcac399cc421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_600fcede74107.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/definicion_legal_de_titulos_de_credito.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/71980839815.pdfIn PDF document text
    • https://cdn.sqhk.co/zevolazezag/ajhuutU/niranuzodebonopebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_600114618d125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5fec28f8a2442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixomirorubu.myartsonline.com/32255763934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2c8982-73e4-43c4-a5ef-fbe45c20a804/5614874059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a334c96-ea5b-4268-8aae-6102f4ba5b9c/puxuzawojar.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/craftsman_eager_1_lawn_mower_oil_change.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/effect_of_globalisation_on_indian_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18fd32f7-c492-4753-a53c-e19d11957e69/beauty_and_the_beast_piano_sheet_music.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/naloboxelutawomal.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1B1 5104 bytes
SHA-256: 36fe6e17509aa37b439cfe46f8bf640c5c91359815b28fa1f913951cd2bce908
font_01_sfnt_off0002030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2030E 10560 bytes
SHA-256: 8b862d5a59b9bbc29648851afaba794f9b186234340e140263487167ce21e3b6

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