Malicious PDF — malware analysis report

Static analysis result for SHA-256 619c158d47777132…

MALICIOUS

PDF

98.6 KB Created: 2021-03-26 15:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5097b6c77d38b8155dee291422fdb1bf SHA-1: f875c4debad7e33776e9ed173aeee8c600fc2415 SHA-256: 619c158d47777132482c1cc40907af1a194745290f2e4e1e6c0a433b7d834712
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains multiple embedded URLs, with one prominent URL suggesting a lure related to programming a medical device, and another pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=how+to+program+a+resmed+airsense+10 PDF link annotation
    • http://tokexal.medianewsonline.com/52953095332.pdfIn PDF document text
    • http://mawifit.iblogger.org/wilton_tip_chart_cupcakes.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ujikwgf/master_s_degree_educational_technology_online.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/98569606642.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/aghgfgf/zaxibunuvodedafop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukisofom.epizy.com/certificate_of_employment_with_salary_format.pdfIn PDF document text
    • http://wagesasalep.rf.gd/boot_camp_for_mac_os_x.pdfIn PDF document text
    • http://xasagode.myartsonline.com/tetevule.pdfIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_254a7d49eeb44d1bb39fb18b0d280d70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takurugilij/android_reddit_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/40812033139.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/41554120434.pdfIn PDF document text
    • http://selafaveso.rf.gd/binul.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/kakutukepixaled.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/killers_anonymous_imdb_parents_guide.pdfIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_b8cf731e80414bdf9f445e13592e03aa.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_09c637d2ac37479c84e491db12fa4625.pdf?index=trueIn PDF document text
    • http://mununadotelax.epizy.com/the_lord_of_the_rings_part_2_in_hindi_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/63608772515.pdfIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_8888169dfbe6463dbe6543c39375d279.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_off00014293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14293 5496 bytes
SHA-256: d59ab341293718ddbf880885ed5564cecb0dab1daac437676f60bec989752ee3
font_01_sfnt_off00015542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15542 11992 bytes
SHA-256: 3ccc24e7893799841fafbcd67cde3ebfc4c350fc3e71a6a7600946ed3ff01a03

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