Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceede961e9bbc3e3…

MALICIOUS

PDF

62.9 KB Created: 2020-12-16 09:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3d4ecb2ba7d745d6d4f8842633b79a2 SHA-1: ed410b31767d8a71d34eece9c323f0b863229401 SHA-256: ceede961e9bbc3e3102b1e3fd6dd5752db8b05b38643f81a535b1611d90b1d69
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 high-severity heuristic firing for a redirector link, identified as an image lure for free-download phishing. The embedded URL, https://trafffe.ru/123?utm_term=ap+macroeconomics+frq+2019+set+2, is the primary indicator of this phishing attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=ap+macroeconomics+frq+2019+set+2 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d94ce36-7bfd-46d4-916e-013345da745a/81139260592.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/animal_crossing_city_folk_guide_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc361aa8139af03765501cd/t/5fd144f6a83e8e4d958e91dc/1607550199375/51931567696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602f76b8-c09e-4c9f-82f1-a9e7791b8dd7/32047344313.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10966a879396864091016/t/5fc264c1e6d49a06bbe00231/1606575298157/95374895922.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc779470d716e027b043af0/t/5fc99938887b444c614fd206/1607047480987/missing_411_cluster_map_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b98ef8b-ca2c-4d87-b4c2-7a88efbd1511/64175218797.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/c._m._c_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c50f745-ee49-427d-92ab-df41664036b2/icivics_conflict_and_cooperation_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f921d6-9bf9-4279-9d38-a6da202d2eca/pupapunibagibenunixevolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d348073-a478-4eeb-b225-f0303155d2c6/the_hound_of_baskervilles.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c9b1a5bc066edfa528b7/t/5fc2500f9ee0f32b879e919b/1606570001844/no_fear_shakespeare_twelfth_night.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc281d924b06a7eb3097406/t/5fcc0b80a87f9f1b19c5c054/1607207809417/2_feathers_tied_together_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/alif_se_full_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91536698-ce77-409a-9a4c-f046137e0f2c/lipefatatalokaburaremofe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5b891972c46e3c962419/1606376330207/race_team_sponsorship_proposal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5529df7cf8c7540481feb/t/5fc81fd9d32d012678ed958c/1606950875232/wirebatenodix.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_off0000b877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB877 5728 bytes
SHA-256: ac93f9f9f9ef21b7513afa5429e77332222e95e530b7c41af7f106d98c7224f2
font_01_sfnt_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 10200 bytes
SHA-256: 027a7191cf947bb4c423962e992ea800fd31d4434edb6a195bd2670fcf75aa9a

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