Malicious PDF — malware analysis report

Static analysis result for SHA-256 758bfcc1ef6d6682…

MALICIOUS

PDF

109.0 KB Created: 2020-11-10 09:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f90536ce7b48596ac7fe286adc75e81e SHA-1: d41452efcca286654237782cc7902dc83fb1bf86 SHA-256: 758bfcc1ef6d6682817b7c3f707e20a340e3f294ae52b377edddfc7f4914ca73
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 0.9997

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://traffset.ru/strik?keyword=conjectures+definition+math PDF link annotation
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/situb_somexilotewinef_wununadi.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/zasakipururexabizeje.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/tememet.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/7e51ee.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/pajukovuxetu/swa_airport_map.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/fefawenosijunavixobozum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89888bdc-e006-47ac-ab04-425fcfea8861/6285580250.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/catalogo_avon_12_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/unblocked_games_ultimate_assassin_3.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/absa_premiership_fixtures_2018_19.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/tulopogaduwesowesobukasus.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/wetafodumixajupifobidusas.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/gemomuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/britney_spears_crossroad_song_i_not_girl_yet.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/famakezim.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 5212 bytes
SHA-256: ebe50ac96bb6f1b4bc6c2e054ebca9f927bb564bfc1e95c39fa10a410ef70d53
font_01_sfnt_off00016089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16089 13720 bytes
SHA-256: 3817d00e2624dba26ea91e22f5e4184e55f1e11ddc3b8493a5d77f20568b84ab
font_02_sfnt_off00018e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E97 16740 bytes
SHA-256: 306125d139a7e3ee35fa897662e6336a5fc42cedc5f9dab9cdaf8030cb6641e4

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