Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ec3aefd652c5d8…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 23:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4a17099b1d889a182346ac6af0908c9a SHA-1: dce0c45bbcf3410350f1bef1f6ccb79917681283 SHA-256: 53ec3aefd652c5d8f8f70c67f2d8caee92876a9eb9c32abd3b39ffabcc46944b
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 PDF download sites, a common tactic for distributing malware or conducting phishing. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly indicate this malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious domains like 'lozipotod.ru' for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=math+addition+and+subtraction+worksheets+for+2nd+grade+pdf PDF link annotation
    • http://ogranicbio.fun/dibrugarh_university_bsc_mathematics_major_syllabus9aqm2.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/39869175650.pdfIn PDF document text
    • http://kazimibi.getenjoyment.net/architects_in_hyderabad.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/bavenogavebebeporivuku.pdfIn PDF document text
    • http://bas-vorota.ru/93289251791s8rlc.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://zitulogakapede.myartsonline.com/bruchrechnungen_bungen.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/windows_10_home_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/jaguar_car_hd_wallpapers_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3ad2a4-bc04-43cd-9d76-15b4d8dced33/50704273727.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/90811634096.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/zepagefofav.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_8017dd94a4cc46bd8bb7313f804b60fb.pdf?index=trueIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_6691246012f540a4a6c81ddb05fffe73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06448278-c926-453f-87fa-2708cbbfbd64/89504773300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e43255-1ac0-4822-9bba-43cd371412c4/tuesday_with_morrie_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/gutanotumized.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/jysk_queen_bed_sheets.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_ffc46d888c4e4f71853b8c8cb28a2a3b.pdf?index=trueIn PDF document text
    • http://gegurobaz.myartsonline.com/yaseen_sharif_for_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c0c312-00e0-4b7f-b9ae-e7bba8809a26/20266707838.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_87a1965bdeff416cb626099886434c9f.pdf?index=trueIn 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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5700 bytes
SHA-256: d92c6c7fd7f7abf3a47a1c7e7a165b80120f34e0f5920085f8656b662a3998da
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 11396 bytes
SHA-256: cab8bfcf768b0b451fae0bb2824fd5df26726fcd16af5e9131cc90474a5c8feb
font_02_sfnt_off00012953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3