Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdca91f0787f4c1…

MALICIOUS

PDF

78.1 KB Created: 2021-05-28 22:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0b0833772ef2e2a7edfe6f0b560a82b SHA-1: 220a43a68629a72ff7fdd18396c0bb9061946c5c SHA-256: fbdca91f0787f4c159a85fad23f0ad0317142ae43249e89c64d15c06cd14c7f3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the document's apparent purpose of luring users with movie download links point towards a phishing attack.

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://maypoin.ru/strik?utm_term=download+film+warkop+dki+full+movie+salah+masuk PDF link annotation
    • https://siteketu.weebly.com/uploads/1/3/4/3/134362374/wujosukugojivegir.pdfIn PDF document text
    • https://lolugaze.weebly.com/uploads/1/3/4/6/134656459/d385f4b7f977e.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/cb5fee3.pdfIn PDF document text
    • https://ziremaga.weebly.com/uploads/1/3/4/8/134850228/758603.pdfIn PDF document text
    • https://kabatinamipe.weebly.com/uploads/1/3/4/6/134636342/ramabupuguluji-jonogiwor-wejenowese.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/jixudivib.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/vexigumos.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/pokusowap-tuzovufoxuwi-norewib-digajuboduje.pdfIn PDF document text
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/b13970e08f9.pdfIn PDF document text
    • https://xeresitemuja.weebly.com/uploads/1/3/5/3/135311884/japinajen_benewut_pakujuropapa.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/57efcbf9f74bf.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/sixufuxebajul.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/5346887.pdfIn PDF document text
    • https://kuwavumiwedow.weebly.com/uploads/1/3/4/6/134673312/vetozalubumifamos.pdfIn PDF document text
    • https://tabugutiku.weebly.com/uploads/1/3/2/6/132682541/382068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28f680d-93cf-4fec-8175-841c277404af/pubitisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69748be-ab59-4a7a-9812-2775115cab0d/32978510560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64aa4e71-5101-40db-9f3f-dde97f0a3c88/how_to_get_hidden_pictures_on_iphone.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_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 5496 bytes
SHA-256: 1f495b2f2564311d99fe86b3acee67ab1522e518f7deaa41a220bb79ecc3bb07
font_01_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 9912 bytes
SHA-256: 2de64e46a6d5308baad45cd51ed31594c63647941f727b9468baca61dd7d18c5

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