Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7f185fb6a805f2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-18 07:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80deb14ad9410b6047e8301256ebd7b3 SHA-1: d20366df30a7c86e979e1ee3384ccc16d602322b SHA-256: cf7f185fb6a805f28b873bf761799965a7edc81d42ae7b8b2c6ee0eafb210a62
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to be related to accounting software, suggesting a lure to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=buku+akuntansi+perusahaan+jasa+pdf
    • https://cdn-cms.f-static.net/uploads/4465941/normal_603901ab9c0be.pdf
    • http://cmbclientes.com/do_you_really_need_body_armor8h495.pdf
    • https://static.s123-cdn-static.com/uploads/4485172/normal_60090a98d701a.pdf
    • https://cdn.sqhk.co/xitilesuxiw/Kzhidjh/18643827567.pdf
    • https://cdn.sqhk.co/fefowofuk/jghgsZe/trenches_lyrics_tee_grizzley.pdf
    • https://static.s123-cdn-static.com/uploads/4416151/normal_5ff5db4d20d25.pdf
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fdc371a77f7b.pdf
    • https://cdn-cms.f-static.net/uploads/4374517/normal_602d616b2df27.pdf
    • https://cdn-cms.f-static.net/uploads/4446643/normal_6032641b71d63.pdf
    • https://cdn-cms.f-static.net/uploads/4473030/normal_6015424c76bae.pdf
    • http://prizinsta.online/momugezasobokcets.pdf
    • http://vitrinachel.ru/nexopudibenelorodexjyahk.pdf
    • http://skywonder.space/wepasirusobufuwemimawotjw7sl.pdf
    • http://creditscorehelp.info/zewewosevukadaxenun96af6.pdf
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5feeb0528ddc5.pdf
    • https://cdn-cms.f-static.net/uploads/4388181/normal_6011545ec33e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/95059815701.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/jacaranda_fm_playlist.pdf
    • https://s3.amazonaws.com/zerepuzuze/albatross_golf_banguide.pdf
    • https://s3.amazonaws.com/gixawetopoli/juleralibeviva.pdf
    • https://s3.amazonaws.com/sezebepit/51297105781.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_off0000f013.bin
a2e97e88607cd0991f1233dbdd36fa4adde73c8957a8cb02d883b8b49cb2527c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 5284 bytes
font_01_sfnt_off00010212.bin
d48b01cd7879ce67e2f1c6b59c638f030b625b3b7b400652e08e017e60c49836
pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 11104 bytes