Malicious PDF — malware analysis report

Static analysis result for SHA-256 29502d59e113a845…

MALICIOUS

PDF

78.2 KB Created: 2021-01-10 18:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 907e2fb2c0efec8aa23cf95247010200 SHA-1: 8ba2e3f95564bd45390fac2b66a3a747ef5a6a56 SHA-256: 29502d59e113a845ae73b7dad6cc24f535d09a35a8f78d09f9cc8144b6131e46
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or redirection attempt. The embedded links point to known malicious redirector infrastructure and a link farm hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=s%25C3%25A0i+g%25C3%25B2n+bao+nh%25E1%25BB%259B In PDF document text
    • https://site-1171568.mozfiles.com/files/1171568/baby_adopteren_amerika.pdfIn PDF document text
    • https://site-1175626.mozfiles.com/files/1175626/party_hard_go_download_apk.pdfIn PDF document text
    • https://site-1172822.mozfiles.com/files/1172822/ualberta_calendar_engineering.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/kemorofupapewiwegawaniju.pdfIn PDF document text
    • https://site-1203080.mozfiles.com/files/1203080/likee_apk_download_online.pdfIn PDF document text
    • https://site-1180426.mozfiles.com/files/1180426/clavinova_yamaha_clp.pdfIn PDF document text
    • https://munazuzane.weebly.com/uploads/1/3/4/3/134350045/gexasumitudam.pdfIn PDF document text
    • https://site-1176887.mozfiles.com/files/1176887/vubelosakovupodixemeda.pdfIn PDF document text
    • https://site-1168006.mozfiles.com/files/1168006/paypal_vs_apple_wallet.pdfIn PDF document text
    • https://site-1214259.mozfiles.com/files/1214259/digestive_system_labeled_quiz.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/f0e50e.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
    • https://s3.amazonaws.com/wefemabeni/chitralahari_movie_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/preterite_yo_form_of_dormir.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_off0000dfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC9 5004 bytes
SHA-256: dbae32c2596a06e28425e6f172ad4103c6980e864210917087efd587f735de2a
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 21688 bytes
SHA-256: 170d04936db74d93ad3b48127d31009ff3609918e607ce572c024c937ed5e6a4
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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