Malicious PDF — malware analysis report

Static analysis result for SHA-256 af50cd70d27b6c3e…

MALICIOUS

PDF

88.2 KB Created: 2021-03-14 20:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d6703763ca3d8e6c05ae34bff923486 SHA-1: e27bee0e4a72554735481a4d0ae98e1af8ad5264 SHA-256: af50cd70d27b6c3e9909f8c7dca55afa5261b7f664af63fecb8932bdff18df39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. The primary URL, 'https://jumiwimov.ru/award?keyword=ielts+recent+actual+test+vol+6+pdf', suggests a lure related to IELTS test materials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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://jumiwimov.ru/award?keyword=ielts+recent+actual+test+vol+6+pdf PDF link annotation
    • https://cdn.sqhk.co/mitukutowum/gcNTJCf/vuzexetewezebudemejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_6000ec7e5c836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5ffda322cf4cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_5ffb2856150be.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/ij6yqjc/thrifty_shopper_oswego_ny.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5fe140ffef509.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/gegig68/jotidejiwirewidige.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/e5wvhht/knife_clash_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/hivaij8/bijisanusi.pdfIn PDF document text
    • https://cdn.sqhk.co/nujoxodove/hgfhhM6/rupozeme.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/ghgfeEN/sabodelitutibej.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/N9jbPha/peach_raspberry_jam_recipe_no_pectin.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/hgfCheS/dr_davenport_franklin_tn_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/HjejsSF/tatisudez.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/sicrtjb/81770268757.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
    • https://uploads.strikinglycdn.com/files/f2b37ba5-886b-4145-9198-46bf6ea7428e/44505412334.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_23a7fc93c6cf4206b0703748cac662a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fbff2f1-663d-4bff-9fe9-f27c49fb7b63/maserati_granturismo_mc_stradale_convertible.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_756f4393dcef46fe8016be141f623e60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87cc1d30-48ab-4fed-925c-92f098b1e1de/jubamupuwiwarekap.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c7893ed727a346608cd0b18a72ec2208.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_57ac7e30ebbe45ffb44f5d00a7361a85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/535a0cc5-2f82-4055-a010-eb2ec3558cf3/33155880695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436a1a7e-6c86-4820-a5bb-c5503bd00b3d/echo_does_not_work_in_shell_script.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 5136 bytes
SHA-256: 91c4d58a1ce19aa172a0581a08a45324c45552666b24fbf43b5c1b219730a9b0
font_01_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 21716 bytes
SHA-256: 0bece4bd81d4926bad11611463eb50f4c379d3bee68536e048dff21cfa55c5a5
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6
font_03_sfnt_off00014344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14344 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333