Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f0440c0008a38…

MALICIOUS

PDF

75.3 KB Created: 2021-01-25 20:12:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d3ab02654d57376e3f9e69521328586 SHA-1: 3ca36f78ba299908ee678cf86857c6ff7ed51a29 SHA-256: e20f0440c0008a38658c3c8365dcfa15dcea748343ca98aaab5d36dffa2d9afb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One of these links, 'http://portkamesto.site/watch_hd_movies_online_free_streaming_bollywoodyf4sd.pdf', is particularly suspicious due to its structure and content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafftec.ru/aws?utm_term=nationalities+in+spanish+worksheet+pdf PDF link annotation
    • http://portkamesto.site/watch_hd_movies_online_free_streaming_bollywoodyf4sd.pdfIn PDF document text
    • https://jigugupidutugi.weebly.com/uploads/1/3/0/8/130813301/902283.pdfIn PDF document text
    • http://leftoutclub.com/7119447532724wz5.pdfIn PDF document text
    • http://carishr.com/alienware_wireless_mouse_and_keyboard2bwjz.pdfIn PDF document text
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/doboretevadoz-bemabikibuto-suwenelofabar.pdfIn PDF document text
    • http://halfraire.xyz/vesewunuraderiditenupoxly8dc.pdfIn PDF document text
    • http://maximizator.online/65909158404gmcky.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/dilolamasowajabo.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/vufuzewasi/10971746459.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/autodesk_fusion_360_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/breastfeeding_alcohol_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/83808184968.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/jesutazu.pdfIn PDF document text
    • http://poresiz.epizy.com/transformers_movies_autobots_names.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/chinna_mani_kuyile_song_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/love_breakup_shayari_wallpaper.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010729.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10729 17128 bytes
SHA-256: 58704a757378e4c92c7621c49689554e16ac53a9a66e85f60353b356b5539f99
font_00_sfnt_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 5256 bytes
SHA-256: 2a97037cd9534bff70bf982246c558ad33b74ec0827cc65e7b38683a4b241d0a
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 11516 bytes
SHA-256: 673146ee2a09508bceb744ba994a52e07bf888db13e4020c7740e8da06d2d98d

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