Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac1797bcd43bbf1…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 19:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e88349434fdc50f0e9c00fa8a2450e42 SHA-1: d0d4053e24e9a018656dcad6651c32a6468f0942 SHA-256: bac1797bcd43bbf1a0a95e6812c0227b4d907301d6dbeb17a398d07c919967d7
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'nipisod.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to cost inquiries, which is a common tactic for phishing campaigns. No scripts were extracted, but the presence of malicious URLs and the overall detection score strongly suggest a phishing attack.

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://nipisod.ru/wix?keyword=how+much+does+rat+removal+cost
    • http://bristol-yalta.run/22469972878qdjlg.pdf
    • http://electorat.org/637825564000yn31.pdf
    • http://rcasino.info/search_for_google_play_services_12.6.85zf3uv.pdf
    • http://zuxegesa.iblogger.org/84467733020.pdf
    • http://steblin.pro/tamil_letters_worksheet_for_grade_1wdx35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/baf29f3b-043d-4cf5-8170-6fb44f3be7a5/building_a_gun_bench.pdf
    • https://uploads.strikinglycdn.com/files/4a04e7b3-5c61-42a4-82e2-aa7b1c1a5709/ruger_lcp_2_cerakote_review.pdf
    • https://uploads.strikinglycdn.com/files/86e6d6a3-d1c2-40eb-8be8-00ed0843da59/how_long_does_the_vivitar_drone_battery_last.pdf
    • https://s3.amazonaws.com/takebemanijewok/mawejesarozopem.pdf
    • http://virefixifefuke.epizy.com/53915130101.pdf
    • https://s3.amazonaws.com/gebukil/17539793671.pdf
    • http://bumufir.rf.gd/jomutidux.pdf
    • https://7162416e-a815-4e2e-b4b4-2f1b6d3d7a1b.filesusr.com/ugd/0723a7_07c5ae5113ab49ec94262bc06d6bec7f.pdf?index=true
    • http://dimogotewebi.epizy.com/jobewumigipodujelapofo.pdf
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_0a2a282741dc49ae957d5266bf656bd2.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_off0000f1c4.bin
60c4c5b7985136ae8c76fdb26154c0fd630660871572f1d51f338727b43354f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 5292 bytes
font_01_sfnt_off000103a6.bin
1908b6fdb5764ad765001d164001804d305741320bec33ace69911774be2bcc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 11092 bytes