Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb739b902e66333…

MALICIOUS

PDF

75.1 KB Created: 2021-03-25 11:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 074c88fbe78f863bd467d120f604537d SHA-1: 7f6d23be013b01967458b3afe30edbb671b49317 SHA-256: efb739b902e6633346ec81f417777b5d48500dd771b120647ebceb4677630883
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, which is likely a lure for users searching for specific content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristic firings suggest an attempt to redirect the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=bhaja+govindam+song+download+ms+subbulakshmi
    • http://tuvosudokalidu.scienceontheweb.net/xedobagebiwufa.pdf
    • http://gomesuzos.mypressonline.com/jibapegowudaxov.pdf
    • https://cdn.sqhk.co/zefipuvuwifi/jhKieDg/nhl_21_fur_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4389571/normal_6016c624f2d1b.pdf
    • https://cdn-cms.f-static.net/uploads/4365594/normal_605c29a8a320e.pdf
    • https://cdn.sqhk.co/womelage/zia1ic4/xenazutasanuzemovufakajew.pdf
    • https://cdn-cms.f-static.net/uploads/4491946/normal_602b6f8d9f915.pdf
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5fddb2c754dcd.pdf
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5ff3e64d3fde3.pdf
    • https://static.s123-cdn-static.com/uploads/4374520/normal_5fe546aa99f33.pdf
    • https://static.s123-cdn-static.com/uploads/4490364/normal_5ff240dd7c16d.pdf
    • https://cdn-cms.f-static.net/uploads/4497356/normal_6024c48bb21f4.pdf
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fec583d9251a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jodabiladezot/cobit_2019_implementation_guide_free.pdf
    • https://s3.amazonaws.com/nilititonawafim/linoleum_sheet_flooring_canada.pdf
    • https://s3.amazonaws.com/lezerawe/xamadusogewin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d961.bin
a5944c2940f9cc05ba67362737844698aef99f4447c8259dc7a171e970907f38
pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 5308 bytes
font_01_sfnt_off0000eb4d.bin
c3442d2b42c89e949828eeed25ce38190b01c92d450085e0e5212276d20c3d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 11092 bytes
font_02_sfnt_off00011124.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 4324 bytes