Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a558e7f333d7cc…

MALICIOUS

PDF

70.2 KB Created: 2020-11-23 12:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0b3d619de122a9cbbc758b065315c54d SHA-1: 5a605392c69752450fc8cb390296c66ad3bc35d3 SHA-256: b7a558e7f333d7ccd07bdc932d17f3ad531341c256a2a884cd371774fd14170a
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=bill+hinson+obituary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fb37e1162c82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f8a864c5b800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5fb2faabd483a.pdfIn PDF document text
    • https://xilamakiluf.weebly.com/uploads/1/3/4/6/134668497/tegaxulaso-nuvefuzekob-zulifudemuru-fetipilarudebit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fb73d9711478.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/gofiguj/boss_gt_1000_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/us_history_chapter_8_test_review_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8536264-4f00-4b93-abc1-334b2ffbbec3/32249536257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81da8721-7e5b-42d2-8a99-b60efbcaa012/37886590231.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/go_math_k_6_think_central.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/curso_de_ingls_avanzado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf39e9d9-8343-49ee-8dc7-5993b813b01d/tobumubuzalerikebiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b892ac62-4073-4a65-956e-b5eda50d80d9/91708133755.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/38053891409.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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 5064 bytes
SHA-256: 5a98a7abbb3eb1e8119de0877fa7c5503fdf8ad4eb9d94bf2c9e36c17ea574e6
font_01_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 10804 bytes
SHA-256: 7cb17c486b66d301b4d7404f0e41bc82ba19ca8b3fb15270d9583276e485a8d1

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