Malicious PDF — malware analysis report

Static analysis result for SHA-256 26819e399dcc26a9…

MALICIOUS

PDF

85.3 KB Created: 2020-11-14 02:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b2064f93fe71e52bda9709bba1b2ebd5 SHA-1: bc8acc427093d58ce82c60d7ce8dabbe531c1acd SHA-256: 26819e399dcc26a9c1a124bba5e6c5cf57f3c033ad3040530f8db29c6f9b83d4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector used for phishing, linking to a suspicious URL. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users to the provided URL, which is likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://traffnew.ru/aws?utm_term=banshee+season+1++kickass PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408174/normal_5f93ac862cfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fa85502e24c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_5faf09f24526f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/93d25ac0-54a9-4974-83fd-b08b45fef4e0/16414816336.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/daliwolozanoroloroj.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/how_to_make_the_color_gold_with_food_coloring.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/44214416360.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/white_s_auto_salvage_lewisburg_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3df816-dec4-4796-aef0-6f4cf9545c98/gozetolazekoledafuko.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/sefokolud.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000111ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x111FF 23072 bytes
SHA-256: a56cbb15305f31d8651ffe2c8b8f9f973390369af357b30b789c030744f49171
font_00_sfnt_off0000cc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5E 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 4632 bytes
SHA-256: fcbd3ec14ff5d3232926b4edfe5ff84ebcb82986d1c2faf8209bcd0d4765a86d
font_02_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10768 bytes
SHA-256: bbf7449635c01f9596c10cb8de911f66f157674e9523929c2db538abb1995861
font_04_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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