Malicious PDF — malware analysis report

Static analysis result for SHA-256 b303af727af1fe23…

MALICIOUS

PDF

96.8 KB Created: 2020-11-13 15:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9188b91d5ad129675ef0acbbd9fe348d SHA-1: ef19371a2ebbbd4bab2323b91d00d7b547d455de SHA-256: b303af727af1fe23f982108d3cafd06e68855d879ff4092608a62d649554c1b8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to SEO redirectors, indicating a link farm strategy. One prominent URL, 'https://trafftec.ru/123?utm_term=comparing+the+english+colonies+of+the+new+world', is identified as an SEO redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/123?utm_term=comparing+the+english+colonies+of+the+new+world PDF link annotation
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/duvidiretejubemawe.pdfIn PDF document text
    • https://zupusifeduligam.weebly.com/uploads/1/3/4/3/134313264/1556974.pdfIn PDF document text
    • https://povozunalurowub.weebly.com/uploads/1/3/4/6/134665666/8de685a.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/giwijabolodojef.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/1349961.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://s3.amazonaws.com/murudute/19716515046.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/70680009057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e00bb2-493d-43b7-adba-ee1f5bafc029/terakel.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/cessna_210_parts_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/sivoxivawo.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/falefotanetalofevajajero.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_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 5472 bytes
SHA-256: 9ba8879316b2f988c3d9a6deb525896366edc77d8a03492f7de25c75621f1913
font_01_sfnt_off000144b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 10284 bytes
SHA-256: 5cfbc844ec23a46308ba1a6f9319f052461073456da095a775845a0af2e6ee6b
font_02_sfnt_off000167ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167CE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361