Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c3ed2812f8a91c…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 19:35:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5ec9596c87fce01e616a072c48c8c27b SHA-1: fa39d6a79b495238add3ac1a1e7518f8bfebfc63 SHA-256: 09c3ed2812f8a91c5a344e425fb900b9c9c283c445bac8c43e417b49a7dabd45
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though partially obfuscated, suggests a lure related to humidifier cleaning, directing the user to the URL https://bologen.ru/award?keyword=how+to+clean+a+warm+air+humidifier. This URL is likely used for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=how+to+clean+a+warm+air+humidifier PDF link annotation
    • http://strongcreditscore.info/letter_b_worksheets_toddlersahq0s.pdfIn PDF document text
    • http://gamedv.design/parametric_modeling_with_autodesk_inixta6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5fde18007d1cc.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/torarubape-rejafuda-mavazarowugijub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5fd040ddbba7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_60011fef8ba1f.pdfIn PDF document text
    • http://pubgucbayim.com/schwinn_ad6_airdyne_exercise_bike_partsacada.pdfIn PDF document text
    • https://punizino.weebly.com/uploads/1/3/4/3/134327780/7cdd2fb645523.pdfIn PDF document text
    • http://1pokypki.website/32157004321r73gw.pdfIn PDF document text
    • http://ihsteam.ru/zazowejivetumuxzjz4o.pdfIn PDF document text
    • http://mosasekoz.22web.org/ielts_speaking_tests_iravani.pdfIn PDF document text
    • http://hookup154.online/vewotifabujosogabiramajuae7ln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427104/normal_6008e2676f5de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://milodip.epizy.com/xeratij.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/60681724186.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/uc_ab_540_form.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 5136 bytes
SHA-256: 4fcda78f79fcf9edeb960b78eff847f608460f13e53efce4746a7dcb950e56f2
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10672 bytes
SHA-256: 7016424c419e0487ec52cf96064d630f1652d0d01734512052db12d2e6a24dcb