Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c6192a73f6972e…

MALICIOUS

PDF

73.0 KB Created: 2021-03-01 12:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5f5a65abd04fa6a54bada09945647255 SHA-1: 43408d5eac4508e460feae9ec78558f2fa35e285 SHA-256: 74c6192a73f6972eb4cbcf30d46137981e40383019bf9e5be1d492db7068d4b8
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Umn math library' and 'wkhtmltopdf', suggesting a lure to a resource that is likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/wix?keyword=umn+math+library PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/aifjjtS/48096493136.pdfIn PDF document text
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/0e586b031860f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5feb272e77581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_603540808113b.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/nikilefojad.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/8763302.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/6061744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6010476001ffe.pdfIn PDF document text
    • http://reduslim-italy.site/the_bent_rod_is_supported_at_a_b_andman6s.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/eiaihBw/crunchyroll_naruto_shippuden_episode_222.pdfIn PDF document text
    • http://tevfikyuce.xyz/endless_tower_guide_ragnarok_onlinezh1i9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_5ffbfea6231be.pdfIn PDF document text
    • https://cdn.sqhk.co/fusojafiza/jghafZQ/bigfm_radio_frequenz_dusseldorf.pdfIn PDF document text
    • http://datinge.site/265615733500mr6b.pdfIn PDF document text
    • https://cdn.sqhk.co/jilanukubok/Pge2Dt4/dragon_quest_11_casino_cheat.pdfIn PDF document text
    • http://7lessons.fun/44220116054ur9un.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/dedinavesute/hyderabad_police_lost_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/shadow_and_bone_trilogy_collectors_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/tu_puedes_sanar_tu_vida_audiolibro.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/jajuzafilugegoveg.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/47356958717.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 4980 bytes
SHA-256: 7afb01b679acaa5d060fae8066f5defb17bd10186c439f69b43fa6ca7b9e6988
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10384 bytes
SHA-256: 5712ee3f9e06056674f1a9d198e6421cba25340ae2a0124cbca88774fd429d5a

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