Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28c154ce1b6e365…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 17:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 64edf085b0ee50b0a6170312194092f7 SHA-1: b5a40cb464e608a1d5b3b167e794c426d30681eb SHA-256: d28c154ce1b6e365299719a03587b7f0a3317d3ccdc6a974289f698e0e9124a4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'Types of membrane transport pdf' and 'wkhtmltopdf', likely a lure to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://pelibifir.ru/award?keyword=types+of+membrane+transport+pdf PDF link annotation
    • https://cdn.sqhk.co/gafisasiwu/awjdhf3/top_hits_today_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454807/normal_5ffc6bbe8691d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5fee2a9a33f75.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/gcWjhhq/condado_vanderbilt_hotel_puerto_rico.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/iRhgjgO/azamara_journey_cabin_6090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5feafa76e9449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fcff6bb6fe97.pdfIn PDF document text
    • https://cdn.sqhk.co/wujodazera/jbjdmhj/sunewuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5ff67386589bc.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/ijhhatD/nice_guidelines_for_childhood_asthma.pdfIn PDF document text
    • https://cdn.sqhk.co/dorusafe/udidgj2/82748208511.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/hf7Djci/new_buildings_in_dubai_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fcf6a0b01249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_36a42b0059704a39a8a962d7553df2e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/49105824098.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/tagalog_to_english_dictionary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/phool_bane_angaray_movie_3gp.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_8c7cddd3ec7f4e548d221ac33622539b.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_8a84ef43d981453f90f85206e724bd0a.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_049bee17c2ee49d199326a1c537e6c11.pdf?index=trueIn 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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5344 bytes
SHA-256: b482af05c1d548aa331c8ec203ccd7ccc833cbf617ec9282fe7a6655c661d719
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 10092 bytes
SHA-256: 532f2ccaf3e8c5884e161ea9461cdf03b0f9c438bfe4321d6f805305f835d994

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