Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b75000e5a9a51ce…

MALICIOUS

PDF

77.0 KB Created: 2021-03-27 09:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d8dd28cb2296e0e4db5b2c9f2904a8ae SHA-1: 55d96ff25c039d00bb7e86af13db5a384b61e7b0 SHA-256: 0b75000e5a9a51ce2b00d63706c31cce362adb6ce0457ed581c466f9f97ffd23
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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.
  • 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://kuzutuzo.ru/award?keyword=structural+reliability+pdf PDF link annotation
    • https://cdn.sqhk.co/mojekuvugise/hjIxF37/3075835055.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/21a4bb269ce.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/Liejjjh/mipapujuwazidipowasuwipuj.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/vidogumaxewosak.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/heJRCa0/lobuvidunewufedawipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_600638f39d568.pdfIn PDF document text
    • https://wopixidotawus.weebly.com/uploads/1/3/4/5/134506387/7776646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475559/normal_5fdbb4d870c3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/masevewi/does_dodge_offer_lifetime_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d72786-2128-4a2e-878c-ddca382a8265/no_eye_has_seen_nor_ear_has_heard_kjv.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/48486539632.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/98376993422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f567e4-e541-4962-8da4-5c72cebc2858/power_plant_problems_in_india_for_mechanical_engineers.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/43152821138.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/free_sample_employee_handbook_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791557ed-5c14-4084-995b-d45c0deb489b/biden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0267782b-44fc-495e-8f5a-c7107924ee22/32035418032.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/super_bomberman_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/xilagetagokipetanof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73c2012-b6e0-41bd-a9c2-b2e4885721bf/gizololobaredujinaputesa.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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5316 bytes
SHA-256: 55a4db34d063fee29ba419c2e9779c8d3f4ba4b81f5dd363137bbd4fc85e81ba
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10868 bytes
SHA-256: 5b40647bf1d4d2f5d2568d098a30602bdb68e27c937abc6112774f12b42377ef

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