Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b1e07831dccba7…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 00:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3db52516fceebfc95d6736c749095040 SHA-1: 34af7ab52f1f53e5402425bbde0c95afb77cc5cc SHA-256: d7b1e07831dccba7edf5c4411fa879e92368c5ab86fd324da98ef521e5d91f87
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URL pointing to 'zajinet.ru', likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to cognitive milestones, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=cognitive+milestones+for+18+to+24+months PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369927/normal_602489cb69e7c.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/gxPAVgg/29985889916.pdfIn PDF document text
    • https://cdn.sqhk.co/diwewiduvaz/ieyijqI/tegijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fd0472210e12.pdfIn PDF document text
    • http://newsportstechnology.ru/rivesezifuzujugafiudt.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/jhijhu3/tuning_fork_test_meaning.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/case_files_gynecologic_surgery.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/chmezRH/fowanipesinusuderinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6027cbcdb9898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_604f5bcf34f73.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/d4jdfn5/daily_routine_list_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_603a1c8dd7090.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwosowo/FtHgia0/case_study_presentation_template_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/icmw2gh/vuran.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_6018e73edc22b.pdfIn PDF document text
    • http://azorocheat6.xyz/nba_2k18_best_free_throwwupdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426688/normal_6007564cb4639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://legokejapo.atwebpages.com/affordable_housing_sepp.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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 5308 bytes
SHA-256: a60a77f3a485babffa6af37ff44881da2729854e2decd389cb41066407653c43
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10768 bytes
SHA-256: 7d7623b10bbdc550ced950e250a2acd07f298b75144dd92734529b536a095f9e
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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