Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf204517d6bbcaf7…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6e37cd090200de32bd742ce62b0b9f7e SHA-1: 1e366e61df987de3988c15817fda27eb93707896 SHA-256: cf204517d6bbcaf7d0ded6a7a608b34dfdabc26afc0c0a36efd6fc00b5343aa1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, including one pointing to an IP address, which is a strong indicator of malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature. The sample likely functions as a lure, directing users to potentially malicious websites for further exploitation or phishing.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://2478.ru/admin/ckfinder/userfiles/files/88048671049.pdf In PDF document text
    • http://tw-sincere.com/upfiles/editor/files/87440375169.pdfIn PDF document text
    • http://rococosofa.com/files/files/bekivux.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20211001_030503.pdfPDF link annotation
    • http://karat-dobremiasto.pl/userfiles/file/74324336287.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/zoxisazizusolowasi.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/gejoratubudimobematesig.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615024df212ef---gazowumadu.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/luwivuwozezopepatujakal.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/62423561257.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nutid.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/68560855689.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/33093546891.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/92130166497.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/84713916852.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/jijanomaw.pdfIn PDF document text
    • http://uchid.com/uploads/file/vasawazo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e3defa7a4afcbd88de6f373fd2781e1/japukewisuxeravalo.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/25/napamuvazefeku.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/31567652725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=extrusion+of+polymers+theory+and+practicePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFD 14932 bytes
SHA-256: 6a0aa85c72d1e678835b7479fb36b0afbc8a569ae705e87f812eb4777d7af640
font_01_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 11184 bytes
SHA-256: ad6cb90fdaaa8ecbc1d29258a4446e49d9d2ec387714770b37ce8ea8024297f0
font_02_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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