Malicious PDF — malware analysis report

Static analysis result for SHA-256 958dbe5b1e6f67b4…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 21:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8828ea103de06d9926c1910b7686c8e5 SHA-1: 5289e45795096cda9139340cca0076ce2cfe381a SHA-256: 958dbe5b1e6f67b42fab5bdf3adb6e0f1b3e62d9e98fb135a770cb23a3a81d62
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 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

  • 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.
  • 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://mezovuduw.ru/123?utm_term=emotional+love+story+status+video PDF link annotation
    • https://cdn.sqhk.co/vonofuguniti/hjgjijd/didozopi.pdfIn PDF document text
    • https://zevikevugibemu.weebly.com/uploads/1/3/2/7/132741211/1359265.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/99084028658.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/063ed43acd.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/almost_lover_piano_sheet.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/mojazoviwivunesugodo.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/jbujcTf/harvest_moon_neil_young_live.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/d21fa954-3fa9-46b7-bbe8-195d66d59b32/why_was_the_berenstain_bears_cancelled.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_6031c15561024be29bd6acf0e426ca53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa5b1fe-f64b-480b-af25-856995dadae0/mr._coffee_delay_timer_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3becbe9f-8cae-4b63-831d-d75fc982bbff/49925450469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befe9d73-3d34-4617-9b06-f71f5dccf3b5/gimp_2.10_user_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3565d167-ced3-4758-a194-2ecad5b44e5c/26213631465.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_56596f21ed9a4a619d95c3313feab484.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/093f5f3b-59af-4678-8603-cfad6fb68509/27647309229.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_3084fd63cbe54d299d448d41c7d1f614.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae04d9f-eb26-4d88-845b-464c2c59372d/31073416818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad83de80-9888-4529-b35c-c45f06112e8a/camp_group_games_no_equipment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7ef20b-111b-4b71-aabf-68282de69a2f/how_to_use_a_breville_toaster_oven.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 5092 bytes
SHA-256: 88c294115cac3e8a784f4a920271d32eb6863eec899013c8b573edc39a9b42b2
font_01_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 1792 bytes
SHA-256: 1b46d5bc4fdbf0d6fe8c63cd43ee594182eadc69f4e4c2f28049411ad73c8202
font_02_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10400 bytes
SHA-256: af14b3608c4ce85ac97e47e7a413626ef0e66d498e429e5398e70af20eb57bda

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