Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bda09f089f74221…

MALICIOUS

PDF

427.1 KB Created: 2021-04-02 09:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d5751b19d0ce611fd73f8460ca8dfea SHA-1: 28c16d8cf711edc4500b5d6cb2ac4bd7b93bf8b6 SHA-256: 4bda09f089f742210b8b5c31265c9502789644791c4c8fc402d16b9fbdb746b9
136 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and a heuristic identified an external URI pointing to a suspicious domain. This indicates the document likely serves as a lure to a phishing site designed to defraud the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8966

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://mezovuduw.ru/wix?keyword=monilophytes+homosporous+or+heterosporous
    • http://lojapidabud.mypressonline.com/rasaxivumakidibaweke.pdf
    • http://bonapimum.iblogger.org/vamugidijekesefa.pdf
    • http://bagerisevi.scienceontheweb.net/dependent_personality_disorder_treatment.pdf
    • http://pugisapi.mypressonline.com/pdf_file_to_jpg_converter_online_free.pdf
    • http://zawugudumi.getenjoyment.net/what_is_the_best_sphr_study_guide.pdf
    • http://pewadulojuba.mypressonline.com/dojasazonaba.pdf
    • https://cdn-cms.f-static.net/uploads/4387701/normal_602826816a8cf.pdf
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcda073ab7ac.pdf
    • https://cdn-cms.f-static.net/uploads/4467945/normal_60284647d39ff.pdf
    • http://bukenisefino.mygamesonline.org/why_was_divergent_banned.pdf
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5ffd4cfb61a9d.pdf
    • http://fudidudigas.iblogger.org/972083463.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_6020592f18262.pdf
    • http://zumepaposakuf.scienceontheweb.net/brahm_kavach_path_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nimuwet/woderaxopolirux.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/72141191034.pdf
    • http://tegazadolital.rf.gd/what_are_good_second_jobs_for_teachers.pdf
    • https://s3.amazonaws.com/gumagabu/nebuledorilixob.pdf
    • https://s3.amazonaws.com/nawosineromigi/what_killed_mansa_musa.pdf
    • http://dujepuxa.rf.gd/analogas_verbales.pdf
    • http://zovibeviniga.myartsonline.com/rivemi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00065bac.bin
c942646e58f19d06143d6dd2e21edc35a90a800a0323c355fbb6bfba05ff42da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BAC 4956 bytes
font_01_sfnt_off00066c6e.bin
dbad1d93ae8515198c6892ddba56e35e16867eef9754bac40e053fcc70c53e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C6E 15224 bytes

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