Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5eba1e936cc824…

MALICIOUS

PDF

71.7 KB Created: 2021-03-17 17:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a856b7177378ed3a559515c3b2651e83 SHA-1: b062edcacfa3538d1aec82eae8af9cc7fe0c1b5a SHA-256: 5b5eba1e936cc8247dd4ccd91396c611471253ded428eec4e47e2a2c3f2a8089
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URIs pointing to link farms hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an intent to redirect users to malicious content.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/wix?keyword=craft+place+pro+apk PDF link annotation
    • https://cdn.sqhk.co/raluzafa/ihjWXid/custom_arrayadapter_in_android.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/Lijjgjn/kodivasilekodobef.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/rutix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_600818ea7ad4c.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/1851_pearl_of_great_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_600f43c02fa51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fc8113d47c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_5fe8b237447c3.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jiaiijb/abalone_shell_smudging_bowl.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/eigidXe/12699934009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470689/normal_5fecccbeb971d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_2e85337496854099bf39a96fc08399b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3964a396-0fd4-411f-a7b5-131ed8f3366e/3911154233.pdfIn PDF document text
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_f23f9fba106d49f38162d66ed2af4a4b.pdf?index=trueIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_5101a9b2e6774cabaa42d09a9b84174c.pdf?index=trueIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_bacf505db42f4b03aa4106fb354baab8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/069ffe15-2b48-4f84-bf50-9f3d83d9e15f/a_suitable_boy_bbc_netflix_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a667e2-9c11-4b59-9d59-ec242b728763/30366177301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad529e0-4500-4efe-aab2-41a3c23efa0f/how_to_exercise_your_buttocks_and_thighs.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_fe37c33f3dad43c2b4148bfa719ad4ca.pdf?index=trueIn PDF document text
    • https://24976a62-ea59-4ca6-8500-d0bd08f9a094.filesusr.com/ugd/65a075_d972c812513740fcac3fd010001ea2ce.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/good_ar_books_for_3rd_graders.pdfIn PDF document text
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_aecab0621db94a0f863840fdd63f7ada.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 4800 bytes
SHA-256: 8609044f18aedbc8daeee4b0ca40782ebd78c108b187b719d82fb9ddc2c94b8a
font_01_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 11460 bytes
SHA-256: 3f2b4b3e01315be2ede6bcea1ad30d75be0ab4c102794dd907d41a7f3ab8385a