Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f3593c06a9237c…

MALICIOUS

PDF

66.9 KB Created: 2020-11-09 15:27:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 70dab9fb7bb77570224ecb05e4262504 SHA-1: 91bc6b3954f5f068a5d2c1553c15ab4d4c87296d SHA-256: 48f3593c06a9237cd2a50043d67c4fe008e7daeb48f092b5dbab001ead9b3c81
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 1.0000

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://trafffe.ru/123?keyword=ashrae+handbook+-+fundamentals+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f8751e6f3532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f8813f306c80.pdfIn PDF document text
    • https://xiliwawegumokap.weebly.com/uploads/1/3/4/0/134096460/b18d99c6.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/fb0387f4f09bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f8d528043ace.pdfIn PDF document text
    • https://firupewuvub.weebly.com/uploads/1/3/4/3/134330425/2440792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f9162d4c7848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f8861ee80fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5f94cae050a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f91db0aa5659.pdfIn PDF document text
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/livabitazokexoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f87ff6287363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f88b9f4e1369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f873d2c3e384.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/ba9e6faf-a53f-4a50-a5ee-e34e93a8f41e/78953449837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4746f035-d5e1-4376-be7c-426e4d87417c/lovusuravupe.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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 5508 bytes
SHA-256: a7cb5ceb343966fe555714cd64d5a05c36be8ca004114c133532de5feca75843
font_02_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 10576 bytes
SHA-256: 0e501877e6324db477053db7ccb3e27983c7dbdab8117d8e2e31289b954fbfdb

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