Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d57f5e3ddeff01…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 10:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7ef95aa25173f64fb28316b1af95c7e6 SHA-1: 14f03295c16cf23c8dd12dec3b73e1b970e56e6b SHA-256: 57d57f5e3ddeff01a24073f025fdbbbfd218204500f404a89d374da7e8e26995
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be related to accounting questions, suggesting a lure for users seeking information. The embedded URL likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/aws?utm_term=general+accounting+questions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5ff7cffac7912.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jhjggop/woletewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fca38d5cc553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ffb13de69483.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/RFwigB1/bad_day_at_work_videos_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_600aadc30bcdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_60094b0b8aa2c.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/CGhh3C9/gather_round_homeschool_curriculum_review.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/ejflRjh/buvijewexotumigugap.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/oeggqjT/lutakizizowupaberojezexi.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/wetevali/guide_morgana_mid_s8.pdfIn PDF document text
    • http://divojeniro.epizy.com/counter_strike_source_free_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/carousel_android_developer.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/album_bts_wings_matikiri.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/4006756696.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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 5572 bytes
SHA-256: fd4d14b8c661b2a44e7d877f2fc5980a4bcadc0ababdb248129e6e3e55129725
font_01_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10492 bytes
SHA-256: 52f8fb9318548a78cffa2a81e39258ff5d45dac970a4d6a94f9b211017b7f88f