Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da104800b28fc9f…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 22:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 319b45f8949f9ed166d120056742b70d SHA-1: 5df336fa5b5da26ad8edbbf9c07c61d0af4fba24 SHA-256: 3da104800b28fc9f8624bddd7b3dff26f5b7262f237624fbf4759bccb3832b97
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://jottigo.ru/123?utm_term=everything+is+awesome+piano+sheet+music+easy PDF link annotation
    • http://geloritiveda.mygamesonline.org/brand_health_tracking.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/aVjhqeZ/dojunab.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/Qjfhc6s/nawovokemiteder.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/dNhckwE/70599346779.pdfIn PDF document text
    • http://likelid.xyz/338551395722agdr.pdfIn PDF document text
    • http://lnstagramsupportlives.com/14914131300ynb6x.pdfIn PDF document text
    • https://cdn.sqhk.co/todezuzutito/flaiigh/industrial_pipe_3d_model_free.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/28048147385.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/hibihjf/lukivoremuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/gdZIzbh/pidigen.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/jiajdY0/64573838823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14d11b9-47f5-4184-975c-1fac989852fc/why_wont_my_straight_talk_mobile_hotspot_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c354e3-7650-487c-8b83-7f2e44b8557b/nabasafasuketa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/512f38f4-0e21-4a09-bd7b-24a8d982d4c7/why_my_subwoofer_is_not_working.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/fopiwiguji.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/what_is_the_highest_scrabble_score_ever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6add1b52-ae16-4df7-959c-1faac37c6afa/bazibulisosaguwer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde5474a-311c-4cfb-bf17-60f6bc22822d/83300564717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1fe300-a0ee-4c57-bbd1-291bd8b8883b/76405183572.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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5524 bytes
SHA-256: 032b4b63d74c9d3f829f3214fdecc9cb4e18b26241e12ffcc289c8c930610b4f
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10488 bytes
SHA-256: e846244102189dd7ad21fbcc0b03b437ee86baaef5961a7705aaaf2b5d03a86c

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