Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63ca94fe2a690a5…

MALICIOUS

PDF

88.6 KB Created: 2021-03-23 07:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a96d2291a72b9d6d18bc520c9e5d74b SHA-1: d8056b64127e165c3b1700d247b80f75ab208c3d SHA-256: d63ca94fe2a690a51f6ee2826dca09b9bebd19a4d85c8470520a44b675548a18
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 URI pointing to 'seumenha.ru' which is disguised as a chemistry textbook download. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest it's designed to trick users into downloading further malicious content, likely through a phishing pretext.

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://seumenha.ru/award?keyword=ncert+chemistry+textbook+class+11+pdf
    • https://cdn-cms.f-static.net/uploads/4365642/normal_603db35bac3da.pdf
    • https://cdn.sqhk.co/dikapagoloza/s9jhbih/slaughter_3_the_rebels_mod_apk_data.pdf
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fd08d0e73513.pdf
    • https://cdn.sqhk.co/xurakipigub/fFiighk/yeezy_700_analog_legit_check.pdf
    • http://floradoma.net/90481931592k4rf7.pdf
    • https://cdn-cms.f-static.net/uploads/4366312/normal_603eab7109a0e.pdf
    • http://freshka.fun/9335392781983gmw.pdf
    • https://wekakukuzibeli.weebly.com/uploads/1/3/4/0/134000436/lopanawig_niririboweti.pdf
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/7379959.pdf
    • http://zisuroto.mygamesonline.org/kidde_co_alarm_instructions.pdf
    • https://cdn.sqhk.co/ramazunor/dw0gihe/81439760813.pdf
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5fe2bb49cf7a1.pdf
    • https://cdn.sqhk.co/lexewagoz/hfjaENK/45534242894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://xiwozoget.atwebpages.com/46752726226.pdf
    • https://uploads.strikinglycdn.com/files/f7a1f182-6e3d-4290-86db-e3dbf8e93561/what_does_1_peter_4_12-13_mean.pdf
    • https://uploads.strikinglycdn.com/files/fe4a0da8-e78b-4497-9808-69e29d359284/79738826118.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_off00010dbd.bin
95533b18212bc681909143b5bca7b9b9ac848122f4603863151925945fec5e47
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 5788 bytes
font_01_sfnt_off00012165.bin
ecc877ccdc427c261895e122f0678090688b2f5f8819e66832a4fb3b734ddd07
pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 11248 bytes
font_02_sfnt_off000147dd.bin
a4368239f0d91ed332e626a2559f84da3277edf7efbaf1b266963a915635e769
pdf-font-stream PDF embedded font (sfnt) at offset 0x147DD 3260 bytes