Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9db9dde38a6cad…

MALICIOUS

PDF

67.2 KB Created: 2021-03-12 15:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 021e1755221f31d2bf70d10e8bb8c199 SHA-1: d41fc1ee85d764e136f31b9547298f024b9809e8 SHA-256: 0a9db9dde38a6cad9169d57e6d423acb93173b1fb9a568e7dc8657c65b3d1012
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors and PDF farms, indicating a phishing or malware distribution scheme. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics strongly suggest this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/award?keyword=general+topology+bourbaki+pdf PDF link annotation
    • https://cdn.sqhk.co/pamoguto/5hbldE5/zipalani.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/jhb5ihM/vedilafide.pdfIn PDF document text
    • http://zixefeninano.22web.org/activities_in_french_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/idehTHa/93331276512.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/gi2gdVf/internet_speed_meter_lite_apk_free_download.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/lomid-gupunoz-gaxujijogado-tarudadupilaj.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/gOS3GRc/7th_std_tamil_book_guide.pdfIn PDF document text
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/89d1a851c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobovofuni.epizy.com/bilona.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/12581547684.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/pager_adapter_android_kotlin.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/jodox.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/23328501886.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/xirid.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/tigadokoxijipefogag.pdfIn PDF document text
    • http://gumofiwulova.epizy.com/hp_laserjet_p2055dn_toner_change.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_bffdd68304be424eb1de3ad6cb7efb76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pogolo/anglo-_american_literature.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_afcbbb86e1ac46e789cded9605b9bdea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kevava/94701960543.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/74826596565.pdfIn PDF document text
    • http://xatesowogexiwu.epizy.com/kopanazowuxirovov.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/structured_cabling.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 5368 bytes
SHA-256: 1db336883647c1701c5888aca25b737517a19739d0c18afa824777b9f5e7a918
font_01_sfnt_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 10132 bytes
SHA-256: e60eb9dd9214c55bd96c86ce561252a6e2960081dd6132bc8f43a95d43b9a9c6