Malicious PDF — malware analysis report

Static analysis result for SHA-256 829f882b0bf22a5a…

MALICIOUS

PDF

70.7 KB Created: 2021-02-11 08:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 96274643a040d604a84d249d4edb13c6 SHA-1: 8cf1904dbb8478285f21d80a727213838da55c2f SHA-256: 829f882b0bf22a5a60814fc2f5b99a6a31abc623d5e1d67066764d0a0bd917a4
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for a malicious redirector link. The ML classifier output of 0.999714 and ClamAV detection further support its malicious nature. The embedded URL points to a suspicious domain, likely intended to deliver a payload or phish credentials.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/aws?utm_term=making+inferences+pdf+worksheet In PDF document text
    • https://cdn.sqhk.co/jifigetuxu/duOsdp1/pefuxuburebageraradegina.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/opghMLq/15935333702.pdfIn PDF document text
    • http://wownatural.fun/50825726879eg02k.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/hgYHzLr/vudozuzixu.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/jghfjjk/north_star_mutual_insurance_co_cottonwood_mn.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/74054ca2b97b.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hbJuGBB/kilidezosojasewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zikeko/ieee_journal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/cycling_jersey_template_adobe_illustrator.pdfIn PDF document text
    • http://lepejojesel.rf.gd/android_studio_reduce_apk_size.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/53911718936.pdfIn PDF document text
    • http://nudifezidezi.rf.gd/ap_sachivalayam_digital_assistant_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/24434690384.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 5544 bytes
SHA-256: 0c1436f75a312974b404178ae85068bf79ec6678f0097d4e98496e8db705d313
font_01_sfnt_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 9936 bytes
SHA-256: 7902539b1b0a233f9c1df06a2184522ad5563777efe9307b62d96cb86ea8cb41

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