Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a13b857e53db7a…

MALICIOUS

PDF

77.9 KB Created: 2021-02-06 03:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 76a2dbb131fc35ca22efecc48bfdb2fd SHA-1: 7763002faf92eed437dd74a5133d2b994078cec0 SHA-256: 65a13b857e53db7ad8259f47d31c1d83fe4c81bca73c680dfd9a20eb1efaa352
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to known malicious redirectors or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=an+introduction+to+generalized+linear+models+third+edition+pdf In PDF document text
    • http://agencymedia-ig.com/58138827222j0mou.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/Ojhihdn/vr_real_traffic_road_crossy_road.pdfIn PDF document text
    • http://winclean-shop.space/kinedita0q8tw.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/726a0e9d413f48.pdfIn PDF document text
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/4670911.pdfIn PDF document text
    • http://moresukko.ru/android_dialog_theme_full_screenrjhjo.pdfIn PDF document text
    • https://pebawozo.weebly.com/uploads/1/3/4/8/134865175/vodelor_kekibajewujer_junevexabef_bawotudanojubas.pdfIn PDF document text
    • http://kadesevi.iblogger.org/fopogotudi.pdfIn PDF document text
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/5821621.pdfIn PDF document text
    • http://mif-smeh.space/thinking_in_java_9th_edition_free_downloadfbnz9.pdfIn PDF document text
    • http://boxberry-24.cc/sufukugurasotejaxelozesiye5b2.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://veridipu.rf.gd/81452831989.pdfIn PDF document text
    • http://barovupaxar.epizy.com/16512802.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 5488 bytes
SHA-256: de9bda53e949a861987d681671442ccb085e5c7aaaab2890e2abe376e3cc6099
font_01_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 9704 bytes
SHA-256: b2c20adf93e71e87ba9f31e59935feba875887422d4787831b037300324f27bc
font_02_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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