Malicious PDF — malware analysis report

Static analysis result for SHA-256 26575d6a81b8252c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-04 00:19:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 04b8a9043bfbe13ced94d41359ad245c SHA-1: 107baf5af1fec87881b306cfd63e0f2937a150fc SHA-256: 26575d6a81b8252cc02f567f2b4eadfae6487313545f4e890a00cfd5a65404fa
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to an audiobook. The presence of an external URI and the high risk score indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/123?utm_term=the+late+great+planet+earth+audiobook PDF link annotation
    • https://cdn.sqhk.co/bunewonu/gNjfhfG/pay_my_boost_mobile_wifi_bill.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/ggjiejI/88796949845.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/Eghid4q/vevo_country_music_videos_2020.pdfIn PDF document text
    • http://keligekixebar.22web.org/24430153379.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/hetibzC/47125118159.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/gdUjjb1/shogun_empire_hex_commander_full_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xibaxet.rf.gd/96003198979.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/xoxodudam.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/gre_how_many_words_per_day.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/ignou_admit_card_december_2019.pdfIn PDF document text
    • http://mafolizol.rf.gd/42688121260.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/scalp_vascular_malformation_radiology.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/17943332970.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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5080 bytes
SHA-256: bdbc45f8366e420e49fcd5322611a365a0b3a642afe9345cfa240ceb85ffbee1
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10476 bytes
SHA-256: c57348ce98b80e5c7a8b4c0c3db9e050e0ebec83f42422c14821b7ee89846e08
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34