Malicious PDF — malware analysis report

Static analysis result for SHA-256 2886d999928810d8…

MALICIOUS

PDF

79.6 KB Created: 2021-04-22 01:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6fa5a1c98b908cda65ffd3a30688556f SHA-1: 2eb607075cdfabc8b45b02836e4535eae3bec0c8 SHA-256: 2886d999928810d8e6570de70114f30443cf1b570a3f9f6ee5198337dce075c9
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 link pointing to 'maypoin.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of external PDF links, suggests a phishing or scam campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=wh+question+worksheets PDF link annotation
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/60975b92a4a.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/87e01176b.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/seserefazepuwo_selitorofa_vedil.pdfIn PDF document text
    • http://tiriruno.sportsontheweb.net/gareralepikegixarapi.pdfIn PDF document text
    • http://fakaripeti.xyz/49288226677tux4b.pdfIn PDF document text
    • http://maska-respirator.shop/find_words_within_words_game0p0ev.pdfIn PDF document text
    • http://nadahul.ru/convertir_pulgadas_a_milimetros_en_excelpjc4w.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/kovoju-lafin.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/fidobakipivogit/29351720101.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/how_to_use_a_receptionist_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1b0e06-0f81-4aa9-a511-0dd30725d8bf/2205041799.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/dikotolabokezumofa.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/damimideli.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/9107081423.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/odia_album_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/rinalamaviwabit.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/15203803478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9dcf91-6bc9-4254-82ab-9097ade8ecf9/vetoraretojozeremu.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_off0000fb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB05 4828 bytes
SHA-256: 72000e06d8f6390e4bebf9a0d1774040c202c097368f5ddb31852e42405cb1c4
font_01_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 11212 bytes
SHA-256: ee30e7e61e16dd628236a9dbe6d788a5aca2784a00d26cae70727b45dbc2b827

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