Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5c6629713bb70…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 12:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fcb86c84f7051715ec55e8f58508a6de SHA-1: 5798db80a335d3b67b9fd3b7cea1c313bcdbc043 SHA-256: f3b5c6629713bb70e9e29c0b5c1d8f92dafe0432e927c592db0ff2237732b37b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://golowaki.ru/123?utm_term=planet+earth+2+islands+worksheet+pdf PDF link annotation
    • http://kedugobepuged.mywebcommunity.org/42098992109.pdfIn PDF document text
    • http://fonixeguga.mywebcommunity.org/effective_public_speaking.pdfIn PDF document text
    • http://tobaliwono.mygamesonline.org/6th_grade_math_multiplication_worksheets.pdfIn PDF document text
    • http://wejuveziwep.mypressonline.com/synonym_antonym_dictionary.pdfIn PDF document text
    • http://duxinivodozular.mywebcommunity.org/bizagi_studio_user_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenabemaborok.rf.gd/audio_editor_free_adobe.pdfIn PDF document text
    • http://werekixaw.epizy.com/windows_7_default_user_ntuser.dat_location.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/disney_world_fireworks_times_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/41195570569.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/draven_guide_probuilds.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_66eb6da23f84440da4dd33a2aeeadfce.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_922609aace1048a0b408b9302cccbbd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/18386348567.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/nokojox.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7dcfc9d7557f462f815aa5311ef94c12.pdf?index=trueIn PDF document text
    • http://vumovofun.onlinewebshop.net/tezopinog.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/can_priests_use_staffs_in_wow_classic.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5416 bytes
SHA-256: 159509256e1e9808b70d68721ff55955366836d7636e845ee291831c11b2df10
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 11400 bytes
SHA-256: 33773e7e4c63376380b8f10aa4f82a792bb49109d6eba22c8064e429cc0a1629
font_02_sfnt_off00011a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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