Malicious PDF — malware analysis report

Static analysis result for SHA-256 268517f0fea2191f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-01 22:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bf590a65aa1b421caaf2bdbec1e92f59 SHA-1: 64bdd3eca275918a32e3f90e5f60d72eb61997e8 SHA-256: 268517f0fea2191f8b124705acd04c7b362175d6980606aebac1fbdfcf00a94a
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 structured as SEO-optimized links to other PDFs, indicating a link farm or content distribution network. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest malicious intent. The ML classifier and ClamAV detection further support this assessment, flagging the file as malicious phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wb?keyword=how%20to%20make%20usb%20card%20reader PDF link annotation
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/8155493.pdfIn PDF document text
    • https://cdn.sqhk.co/ramojezi/idNNCkG/28893680686.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/yPiiiiB/minecraft_story_mode_cast_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/rghpohd/pavolelolano.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/Jqfhcij/fifa_world_cup_2018_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/N5lgcjg/58409227451.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/gfPhfic/jungle_princess_escape_sofia_runes.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/HNSjaov/wubawofusuresavuma.pdfIn PDF document text
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/wugek.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/qiaggha/gaburazi.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/ggggAih/39457109568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabom/95077570864.pdfIn PDF document text
    • http://govujetimavex.epizy.com/star_wars_flute_sheet_music.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/arthur_spiderwick_s_field_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/panevovujetatu.pdfIn PDF document text
    • http://jufomotapi.epizy.com/25031205358.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 5308 bytes
SHA-256: a8af403e28323b20f072481bfa89f6a740eda39b38699fee55a8fffd85ef3004
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10672 bytes
SHA-256: 6dd1291a8e47823e1d0977805fb8e3afd4e230b3f57c5da979a474619232ec86

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