Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d167c11e14ad10…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 18:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d48c7466eb8641a6a6448b8511bfbb0 SHA-1: 9b55eda0a3b58475fe25d331f7200ecb71958a65 SHA-256: a7d167c11e14ad10431e1ef2bdf5f013fc4ac05cca91973559a399670d30c79e
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a URL that appears to be a lure for downloading books, likely a phishing or malware distribution attempt. No scripts were extracted, but the presence of the external URI suggests an attempt to redirect the user to a malicious site.

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://jacksth.ru/award?keyword=veterinary+microbiology+books+free+download+pdf
    • https://static.s123-cdn-static.com/uploads/4407100/normal_5feba5a992c6f.pdf
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/215040.pdf
    • http://xurivikarode.iblogger.org/96571063236.pdf
    • https://static.s123-cdn-static.com/uploads/4495531/normal_5fc86b0395583.pdf
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/907cff553b.pdf
    • https://cdn-cms.f-static.net/uploads/4467277/normal_5fdc44a34f36c.pdf
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/4039275.pdf
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/gukexogukuwusoxa.pdf
    • http://vuwelumosuwop.iblogger.org/57140810799.pdf
    • https://cdn-cms.f-static.net/uploads/4496148/normal_6020519a473ab.pdf
    • https://cdn-cms.f-static.net/uploads/4413119/normal_5fdad39726b8a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tokatefozude/chinese_dragon_pictures_to.pdf
    • https://uploads.strikinglycdn.com/files/6e9e3d97-ef4d-4b0e-bb99-52caf7aeaa49/73501018354.pdf
    • https://s3.amazonaws.com/dedinavesute/nudolujatiwekef.pdf
    • https://uploads.strikinglycdn.com/files/8f7d8186-599e-4a2a-b90b-29cebc699141/how_long_should_100_battery_capacity_last.pdf
    • https://uploads.strikinglycdn.com/files/b43f3406-1e34-47ef-80d2-1582dbcda8e9/yamaha_g2_white_baby_grand_piano.pdf
    • http://guzupuxidulijak.rf.gd/4487236591.pdf
    • http://diruben.rf.gd/bersa_thunder_9_hc_review.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_off0000e950.bin
f4801b00dd6aecee921991f405282816ce3fa4331bf4c7c979a8715079fd1002
pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 5840 bytes
font_01_sfnt_off0000fd32.bin
528fd30eab86d4db4ec7c38d59aa4c7ffe134cb6120ec27df4d938d79598544d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 10364 bytes