Malicious PDF — malware analysis report

Static analysis result for SHA-256 3843bee3a507b1bc…

MALICIOUS

PDF

77.3 KB Created: 2021-05-19 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8ecf3b9102c5ed7f7d3a074dad6e68e SHA-1: b4d1c5d8c1c07937ebebe39102787cbe1fbc27cd SHA-256: 3843bee3a507b1bc50e07080c4c399ad8b6f37984c30b1ba84e5e8aad5cf68a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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/strik?utm_term=aimsweb+reading+passages+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383304/normal_6060fe7c4f459.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/xewasata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473947/normal_606932fe6da4c.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/zufimofolomujikoziwe.pdfIn PDF document text
    • https://xisedemagi.weebly.com/uploads/1/3/2/6/132681548/xebuxezuj_kiteliworula_jelozo.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/lexaruvoteji.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/kolodiw.pdfIn PDF document text
    • https://rulakufip.weebly.com/uploads/1/3/4/4/134489053/00ca9.pdfIn PDF document text
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/wotoreze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff9177b2a6dc.pdfIn PDF document text
    • https://nofokupefuw.weebly.com/uploads/1/3/4/6/134695722/wowojiga_vebikag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_6039e83656894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6043fd313d20b.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/vikukinumet/17478727720.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/hp_officejet_7110_wide_format_a3_eprinter_specification.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/4330784102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63273ea7-30db-404b-8549-586220b4546a/13626830386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4fbd11-d85b-4725-8722-c379a0466fca/baca_komik_naruto_vol_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e31c7fd-9e70-4c88-9fb9-cd47f8de0eb2/sunbeam_water_cooler_replacement_parts_faucet.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/manual_paper_cutting_machine_15_20.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/megekulafolesa.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/medicina_antroposofica_familiare.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/busy_busy_mp4_video_song_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f752e29c-fb25-4dd7-9520-fdd0f8038cf0/bovon.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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 5552 bytes
SHA-256: 295496af6642bafe624517699dae7a2ae020ad7bf764a2e6e3858a1d853cd0fa
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 11392 bytes
SHA-256: b8025fa9db74ce616277592415145123baa771aa4c09c51c0cd537db2e3fc48f

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