Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fb581b060980d1…

MALICIOUS

PDF

77.4 KB Created: 2021-01-08 19:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9d001751210027ccb5e977f5affc805d SHA-1: 041bd7ca4ec881aa9537b5cfa373cf63355b3077 SHA-256: 48fb581b060980d15977c53e5233e0b05955a552e2ece3d4e1dacbfe6f984ed0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate this PDF is designed to link to a large number of external PDFs, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=whack+your+boss+with+superhero+unblocked In PDF document text
    • https://cdn.sqhk.co/pibegufuxova/ehihhhg/piano_rock_band_4.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/wawipikafolebonor.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/sejuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/aceite_de_ricino_propiedades.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/walter_benjamin_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb5f9df-6ca7-495c-b135-29c287363483/dajajofedo.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/zobamasadepaw.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/mysuncoast._com_hurricane_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aea685c-a2c9-45cd-89c7-aac3fe401702/5416662394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbb441a-21b7-4a09-8786-8cec13022f49/tabla_periodica_de_arturo_morales.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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 5572 bytes
SHA-256: 6563e89ece438b714ea27a6f159cc262f3fed830994948a08116d6a5b089540c
font_01_sfnt_off0001048b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 10720 bytes
SHA-256: f3ef09d5d274c60610bf99ae01b07c6b2336efb294ed75508c7721dd375b1fc4

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