Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb9dbdd8db6d3af…

MALICIOUS

PDF

74.6 KB Created: 2021-03-09 00:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 24f568f2de9b96e00ca02e06c81067f4 SHA-1: e323d23f1535b49f86684733a369b2fa7149fab5 SHA-256: 4cb9dbdd8db6d3afe37c7e2074bc0b97b4badb2d8192d77bb3cf6eb5209a992a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable or free services, indicating a link farm or SEO abuse. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+to+analyze+graphs+of+polynomial+functions PDF link annotation
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/1aafe9f0a8af9e2.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/94505458395.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/walopofovip.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/how_to_get_a_better_rap_voice.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/zerojikenomuxefixutofawo.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/fududobelividerupe.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/earn_money_online_legitimate_ways.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/zigiwasatulodi_bawer.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/8f6d6195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibuxitagarilum.rf.gd/razokana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2013e4de-b9af-4f05-b193-593aee15205e/char_broil_big_easy_turkey_fryer_cooking_times.pdfIn PDF document text
    • http://ximolamerojizud.epizy.com/cholesky_transformation_in_r.pdfIn PDF document text
    • https://24bd2754-ae61-4814-9821-ed06fb6933e3.filesusr.com/ugd/bcd086_b2c614771d6647c2878ef9ae09fe8ce2.pdf?index=trueIn PDF document text
    • http://zofutigo.epizy.com/arere_ekkada_female_song_naa_songs.pdfIn PDF document text
    • http://joluvuworizuv.rf.gd/domowun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26bd69a-179b-4d23-8525-9c9c0a92be81/ruwunivigebozavukalidal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a889298-d76e-41ac-aea8-47ccb40bd97b/monster_island_buddies_godzilla_generations.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_3b34fa7485e748fba0fda50c53ff10a2.pdf?index=trueIn 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_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 5632 bytes
SHA-256: 9ebe78626ad55bb49fd0375269bcafdddb94081de2657c886263bb6616f7d49e
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10892 bytes
SHA-256: bb74a559bc674b23614f8ae610e88716747e143f9958ae947cedf02a076501f7

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