Malicious PDF — malware analysis report

Static analysis result for SHA-256 69da65aa0eeff31c…

MALICIOUS

PDF

74.6 KB Created: 2021-06-05 10:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 92becf9af502c18b41b979b9f00a1b9e SHA-1: c7ae03431f83f2eaa771c6c4cb91e1c9c8cb21f3 SHA-256: 69da65aa0eeff31cf138bc3438f05643dc6d0ea188a18d3e195f767f0ecbefce
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a URL. The embedded URL, https://crewmak.ru/pbw?utm_term=how+to+connect+jam+wireless+speaker+to+iphone, is identified as a redirector for a free-download phishing scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/pbw?utm_term=how+to+connect+jam+wireless+speaker+to+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424027/normal_606a41239ec34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_60298544e4752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_6060b3889835e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fca934b88385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_6013334cc7c2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5ffa8e7ce7bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_60381481cf721.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460045/normal_60aff3e46dcb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_603e48ade0cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_60673c9d6ff4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_603b2cc36b596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_5fe80a97c92bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87d80a1-ba3c-4b37-8125-8843794f143b/xarojuvodusevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10beba56-97b0-47fb-91e2-823e8836391f/43977795503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f34c687-dbaa-4d9b-a95c-d43f6f1e775d/jesu_bleibet_meine_freude_orgel_trompete_noten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfd9009-db97-412a-8cc5-cf9fa30cc043/8321430417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b3b330-ff00-4162-bed9-9429605fed6f/horton_hears_a_who_katie_smiling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b451df0e-4935-4733-a466-100c8a97e91c/how_many_watts_per_m2_grow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d66328d-d5a4-4572-9855-28f8f8f86567/wisideb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993bd876-7f72-407e-83bc-ae9d1a12a620/19388791191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675061d6-fa3a-4471-8168-110b900810fa/puzowexovepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be967eb-af2a-483a-9883-f8479c1c90eb/2979301482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf6c24e-5e60-4365-8600-945ca89fb4d3/timex_ironman_classic_30.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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5364 bytes
SHA-256: e285b354f793877a36cf0d476949bde6fcdb7f52fdea6b3f916deb3da0004c47
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 10568 bytes
SHA-256: bc06cf9de97becf8e03d1514cae41354e0662635ea99464eb864e5f209b39a59