Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b1d12b661821a7…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 06:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a431d1cde5ae0c2accfac493207340 SHA-1: e43980586eb135f2050d36049072cfda7da1636a SHA-256: 31b1d12b661821a7804ab032d84515d620b440170b930a78efcbbfb3d8d7c75d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. One of the primary external URIs observed is https://resalured.ru/wix?keyword=temperate+grassland+animal+life, which is likely used to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/wix?keyword=temperate+grassland+animal+life
    • https://volafonozus.weebly.com/uploads/1/3/0/7/130775232/a0d268.pdf
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/93395b5.pdf
    • https://cdn.sqhk.co/zizenozi/hfifjia/poweramp_full_version_unlocker_apkpure.pdf
    • https://cdn.sqhk.co/wularumijif/jghXhcp/lego_ninjago_blue_ninja_dragon.pdf
    • https://cdn.sqhk.co/suxujaba/hehiGl0/spider_man_free_running.pdf
    • https://static.s123-cdn-static.com/uploads/4491412/normal_5fe4782442033.pdf
    • http://jaraxusej.iblogger.org/71725181745.pdf
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5fdc640a4a876.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/lomokizogeperotam.pdf
    • https://static.s123-cdn-static.com/uploads/4426690/normal_5fe4f3ee2b924.pdf
    • https://zudoxinegez.weebly.com/uploads/1/3/4/1/134108693/63860a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eda6a951-077a-4bfa-9857-b0360ea968d9/43885417252.pdf
    • https://uploads.strikinglycdn.com/files/91524415-415b-4475-a34c-b01a6f0c60dc/past_present_and_future_tense_verbs_worksheets_for_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/35af61d2-db10-4100-bea4-462808b83233/69389167417.pdf
    • http://pinamagowejut.epizy.com/exampro_forces_and_motion_answers.pdf
    • https://uploads.strikinglycdn.com/files/85d7401d-bf46-4040-8623-060630c58e2b/what_causes_sloppy_handwriting.pdf
    • https://uploads.strikinglycdn.com/files/6d86c172-a1a4-45c1-b7d0-2acf38c667a5/41739440126.pdf
    • http://maguzudag.epizy.com/37966973520.pdf
    • https://uploads.strikinglycdn.com/files/d8475a60-e057-4332-b763-ab3c348ad550/how_to_interpret_pre_act_scores.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb5d.bin
363e6aaa91805a641f561c4a5787bcffc1745eabe071a8854f10a5bce6abc61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 5308 bytes
font_01_sfnt_off00010d51.bin
47833653b1d6f80346b9a4c8ce86a4d6a96df7ac6956847077d7ab60b63bbb19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 11024 bytes

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