Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5acddc5aca081a…

MALICIOUS

PDF

76.4 KB Created: 2021-02-23 00:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 048c9f410f4d6fa2d759f43253a8ae57 SHA-1: 53967970c81ff0c4a817255e320a717c9ebd30d2 SHA-256: 3a5acddc5aca081a8ac23c9f8e652aaf65aa4ca2c83fcb4f4434fed2908a8f80
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=linksys+ac1200+manual+pdf PDF link annotation
    • https://dolujutizividev.weebly.com/uploads/1/3/4/8/134864897/rewizezus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5fecf665f311c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_603331ea2b7b4.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/oYhgDjf/18756283933.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/RIUjdjd/magic_piano_smule_vip_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_600156447c367.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/Bxihrid/senadedojilidipijigatefav.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidaxiwuk/MenTjbY/lagasigerev.pdfIn PDF document text
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/977a2526fd28c.pdfIn PDF document text
    • https://zegilaritapedu.weebly.com/uploads/1/3/1/4/131438092/8989759.pdfIn PDF document text
    • https://cdn.sqhk.co/vutowogipu/WTWjawb/70077663820.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/wewuxuviwar/itunes_for_windows_10_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/let_s_go_eevee_catching_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/panera_autumn_squash_soup_2018_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/sapna_choudhary_gane_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/56523779640.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/ludovico_einaudi_nuvole_bianche_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/aatish_full_movie_hd_avi.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/essay_outline_mla_template.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5636 bytes
SHA-256: e4454aecf7b4f28dcd5e62181cf9dc6e2fdfd22e9a768950e3eb11fe91ed4b6b
font_01_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 11336 bytes
SHA-256: 0720fe00abbe2601a1cc80c76bf6ab69d33914ba83bf7dba7fb8bade8d684c10

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