Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f0a7ccb8d60917…

MALICIOUS

PDF

80.6 KB Created: 2021-03-14 04:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01e23acf6ece16d05929d1b62771d293 SHA-1: 6ba52f5a303a1f9f4c68ffcacf1ed0813beaab2c SHA-256: 41f0a7ccb8d609172d0b37917b3096e6ad92f775ccb379df33bcb18ff21a2b65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, a technique often used for SEO manipulation or to host malicious payloads. The presence of a 'download' button heuristic further suggests a deceptive lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=gk+capsule+2020+pdf+download PDF link annotation
    • https://cdn.sqhk.co/gadukupuwe/jfW9gdA/74977678429.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/BhdIhdU/52311957854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5fd2a5deaad67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_601e9563b06d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/vYUmieu/bapude.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/1536226.pdfIn PDF document text
    • https://jimepozuzaz.weebly.com/uploads/1/3/5/3/135350414/4cc9781a2fcfac1.pdfIn PDF document text
    • https://cdn.sqhk.co/zisafebu/haZaGgd/edgar_allan_poe_worksheet_answer_key.pdfIn PDF document text
    • https://savaxibinis.weebly.com/uploads/1/3/3/9/133997587/tudoxolalorijuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_60093c3cafaf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_6036be91cd57b.pdfIn PDF document text
    • https://xufudigu.weebly.com/uploads/1/3/4/5/134515134/kidinajekeguzibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/norejod.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/gimamepawonedesarabiwakir.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/mystic_messenger_answers_to_get_hourglass.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_bc87323765024d2db1a8e4069b83c480.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gebukil/keurig_k_elite_make_iced_coffee.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/birkenstock_exquisite_arizona_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/fm_whatsapp_new_version_app.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_fa52ba948b4c4f88b2db6bdc02b17f69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/build_my_life_chords_c.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_09b5d8de485e461d81d8be8b4f6ddf9c.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_c814209c1a6e4f0d868e749ffd7eab96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/what_is_order_of_math_operations.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5512 bytes
SHA-256: a1dab5aa26cfed6235a0dd06a9f1fa20e65be0769cac35e7912177fd6dad6529
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10912 bytes
SHA-256: 404bbf4e091b2f4d572123b2e4f4d05b0dca19a65b732c0f5cf98db5418304f2
font_02_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 2832 bytes
SHA-256: a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044