Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf74428c3ce396e…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 18:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46a5b8e4759750620e047dfcb34b163d SHA-1: 723d39ea16e6c3067c0a542ba558cdfd8a075893 SHA-256: 9bf74428c3ce396ebfa94f7f59f17f49bdf2664d81cc80241891de90b7c6717c
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on domains like sqhk.co and weebly.com. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

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://baarspo.ru/123?utm_term=lord+of+the+flies+chapter+3+summary+quiz+gapfill+exercise+answers PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/KieFDhd/rujesoriguzesetas.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/hijhiar/dinomao_real_claw_machine_games.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/449497d.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/hgajbha/samsung_crypto_wallet_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/jghdgfL/best_text_alert_sounds_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fdefbcad97e6.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/eCQggEU/final_fantasy_16_xbox.pdfIn PDF document text
    • http://spain50off.info/guideline_thalassemia_thailand4z4cs.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/6gfjfie/sativ.pdfIn PDF document text
    • https://sujuwezel.weebly.com/uploads/1/3/4/4/134486010/6f06e106b32b.pdfIn PDF document text
    • http://hookup153.site/97556404932tylm8.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/RZvjatt/battle_mode_vs_raven_hockey_stick.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393346/normal_5fc9a3a7e0ca0.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/zuponefi/significado_de_short_answer_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/abcd_2019_movie_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/game_cat_war_2_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/vadebemaxodepopilurukiw.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 6112 bytes
SHA-256: 547d8df665cf64b956dbe60c7eae76563913179b4dc2e84ed09b8322b374bc8e
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 11208 bytes
SHA-256: 275217f48a88631df2a318dd7c51757d438989779faf9f78dc7e85cf7608b637

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