Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e314957386b28b…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 09:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 669d5df890ff5787217f658d29221cc5 SHA-1: efca37d8eeef120ef3041ec3f1fc6681e7231e7b SHA-256: a5e314957386b28b6769fb9beb78b4e5ba90e571fea6c0f946a149cd31072875
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is likely part of a phishing lure, attempting to trick the user into clicking it. No scripts were extracted, but the presence of a malicious URL and the overall detection suggest a phishing attack.

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://jacksth.ru/award?keyword=synchronous+motor+pdf+notes
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5fdb1e8fd028b.pdf
    • https://cdn-cms.f-static.net/uploads/4478926/normal_6066b014e758d.pdf
    • https://cdn.sqhk.co/lunemitibojo/pqCehaJ/fiwanakiw.pdf
    • http://ketotreno.buzz/how_to_find_wps_pin_on_lg_phonefs0ud.pdf
    • http://degujub.iblogger.org/impossible_quiz_book_chapter_2_answers_unblocked.pdf
    • https://cdn.sqhk.co/togareguko/idZifGI/disney_cars_coloring_book_printable.pdf
    • http://hookup153.online/33325614649ady57.pdf
    • http://lnstgramhelpcopyright.com/70762544842rm25y.pdf
    • http://chebsvet.ru/xipojewiwixozavepgh29.pdf
    • https://cdn-cms.f-static.net/uploads/4426822/normal_6066f2490dfa2.pdf
    • http://lumacy.site/zinomajufekopowuzalubxvmrs.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_602af94438e02.pdf
    • http://marketitaly.pro/38195935973ggaae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zabobenalug.rf.gd/buffalo_shoes_sizing_guide.pdf
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_b929a321f85c4609a51d6606e10920c9.pdf?index=true
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_81151a5fdac04d0584856c03194f1057.pdf?index=true
    • http://sokozujetabil.rf.gd/legobazisetinoxefaxi.pdf
    • http://dibirat.rf.gd/dibubonisixaviji.pdf
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_595c2fa395564b20aa73a144ca929cb4.pdf?index=true
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_faa3c1d1abac4555bd428b2bbd1374c8.pdf?index=true
    • 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_off0000f73b.bin
3f52a89ee9bc2ad21576064c8b83eecf36583a038345daaedbcd5a721d097256
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 5356 bytes
font_01_sfnt_off00010959.bin
89564781f0a8f7868023e28e9d1e01a65318ca035b2c1f727f9be14566c76476
pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 10392 bytes