Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa315c78fe38c161…

MALICIOUS

PDF

70.6 KB Created: 2021-02-23 05:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8635cbaebee358af3ad1522e7e34aa6e SHA-1: 4a7d54e84ce9c39590d952f30a83bad9bfa54db1 SHA-256: aa315c78fe38c161378007c19bd6951d4ff0a60c3b5f0186db9869fbb5e0b705
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'PDF_URI' heuristic point towards a phishing or SEO manipulation attack vector.

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://druttle.ru/strik?utm_term=what+is+forbidden+in+singapore PDF link annotation
    • https://getifejijepe.weebly.com/uploads/1/3/0/7/130739552/8323143.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/eme1vnY/steamboat_springs_colorado_map.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/jajegurina.pdfIn PDF document text
    • https://bokupotanija.weebly.com/uploads/1/3/5/9/135995636/suxafoda.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gJus2jx/fojekosareposof.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/L0jj3tB/desert_survival_shooting_game_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/xgehjbQ/81899149294.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/3jejjjf/security_camera_sync_module.pdfIn PDF document text
    • http://gufutaca5.xyz/top_cordless_vacuum_cleaners_20201sitp.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/bakoloj/airlift_video_song_mp4.pdfIn PDF document text
    • http://perorudo.epizy.com/98185653981.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/enctype_attribute_of_form_tag_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/messenger_apk_android_4._2_2.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/40520680708.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/bucharest_shopping_guide.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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 5424 bytes
SHA-256: 3bb9de68c4dfa52eeecb00a3809855c5f3d30623fa074aa71475cbdba9ac8a5d
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10668 bytes
SHA-256: 76742f3db1c2a982d52f45e07688292dcbe2768bfea02fea27f1a13c3464bde1

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