Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb51cb5515b4cf2c…

MALICIOUS

PDF

74.1 KB Created: 2020-12-24 21:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 06c88fe751a8d97c4eb126618788a414 SHA-1: 2986ed7ae1916fda9884cf969483264afb476c96 SHA-256: eb51cb5515b4cf2cc9d6f480c54dbc3277d8c29ec5ea40c04f95be29164f05da
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure about learning English, which redirects to a suspicious URL identified as a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URI heuristics point towards a phishing attack leveraging a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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/strik?utm_term=how+to+speak+fluent+english+without+hesitation PDF link annotation
    • https://cdn.sqhk.co/mefomixut/jcNGDja/26037825470.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/IVp6hi9/kusekasafiperusisu.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/mufukep/xikuwoxesiraniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c41054-7134-4858-a266-5d2657b1d226/27638785169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7338b819-8d51-4338-baeb-1e936b3fdc0a/xeveta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3ea7b2-b773-4d25-8b28-dc0a0b6abe7e/91860229635.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/majolixapogifuz.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/90259214766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ae680a-a1a8-4653-904b-c8458f7e1947/cultural_artifact_examples_speeches.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 2888 bytes
SHA-256: 78885e247b1e7efa683895f67bcb90bf022b72a1a9e3ebb6f11a578be93ecb94
font_01_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5184 bytes
SHA-256: 500eeb260718071af175380122faecd7096dec962fc0eeb05088b60eed935989
font_02_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10180 bytes
SHA-256: 5047a9810f01d2cfc7d9936496efae81302083749be8f4b55ed50533e97a0f83

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