Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e25ea979997011…

MALICIOUS

PDF

91.0 KB Created: 2021-03-30 17:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f7e9cc70ead3f3eedefb4a2be4adbb08 SHA-1: d4b40c9065fe175c5e0d2d0ec65426cfbffb4368 SHA-256: a3e25ea9799970111de8b8177366a40de36b502d66df667db78abba7fac99a67
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming technique. ClamAV detection and ML classification further confirm the malicious nature of the file, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://ponafet.ru/strik?utm_term=information+retrieval+course+description PDF link annotation
    • https://cdn.sqhk.co/bevoroxur/gdjcJBn/destiny_child_wiki_jp.pdfIn PDF document text
    • https://buwipifigidorip.weebly.com/uploads/1/3/0/8/130813409/tutazifur.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/ehd3hjz/75322374435.pdfIn PDF document text
    • https://gopasijokalurat.weebly.com/uploads/1/3/5/3/135399025/1964425.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/iBigihm/epic_battle_royale_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/how_to_use_hans_3ds.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/zuninamonegipat_kowukanebafu_fozadetebirupar.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/58534618623.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/jifulugusek.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/jumedemimo/kendo_ui_multiselect_item_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab768d9-e614-4e3b-b540-89e679d29ae7/80950192414.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/math_u_see_geometry_test_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/chapter_17_organizing_life_s_diversity_answers.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/zuvasipivamakopek.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/34026171242.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/49558242134.pdfIn PDF document text
    • http://bemuvarewu.onlinewebshop.net/ffxii_zodiac_age_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622dbfa0-da45-4afc-8812-94fb1367eda4/savaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbceb0a-95e7-47e3-9593-bec0b6bc7de6/learn_english_speaking_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nikotepelipekasixib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492f3311-33f2-4c8c-ab15-7d4a68490271/fodorelesobubuxikibife.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000142ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x142EA 17828 bytes
SHA-256: 1d2a86c21f39b4d66c3e8a61ede144f6de196bd170e724c624c60981c95156a4
font_00_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 5300 bytes
SHA-256: a66811f72557875d1a7f755e09268890710b959a695e162a15ddc25ad00edf04
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 11616 bytes
SHA-256: f639db99ae22631a841d5e22e7737cdf8537133ad8974a0c99e4d576346711ef

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