Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ae44689a03dc84…

MALICIOUS

PDF

41.0 KB Created: 2020-11-08 19:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6f9690d3aa71dc651f45722c884f75c5 SHA-1: de2f1a3e6df76056aad4c1aca700b167bd13cf6d SHA-256: 99ae44689a03dc8479fd1750fa32bfa7a7c44cacff83d17326c4e083e5fc33dd
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 1.0000

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://trafficel.ru/123?keyword=bakersfield+kern+county+inmate+search PDF link annotation
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/zolomovadujidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://pazeden.files.wordpress.com/2020/11/86767518253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced5aa5a-701c-454b-b954-354e1e948acf/tosobenen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c125d3f-9388-4bb2-8934-37705e5fb4dc/adb_and_fastboot_minimal.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/zobepirerelufudopano.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/29616333828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd5a2dc-2559-415e-959c-df3fe0ca9731/wevevizamovuzojunoxaleva.pdfIn PDF document text
    • https://towadababaf.files.wordpress.com/2020/11/mixejitasabivoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542166f1-aea1-4cc4-bb7a-cbab7bff2df5/pumizularikazogiti.pdfIn PDF document text
    • https://gupebizew.files.wordpress.com/2020/11/niwuxixi.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/castrum_abania_gear.pdfIn PDF document text
    • https://bugifiguv.files.wordpress.com/2020/11/zizojo.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_off0000617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 5476 bytes
SHA-256: f8f496714bd9a09fa220c56b197c561c73b9d69ba9253c13687b50c83f2c6202
font_01_sfnt_off00007404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 10268 bytes
SHA-256: 6cdd139c5d41066963d385bb37d7c028a87d8e6bd6a15c70e2ebfef03c3c7825

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