Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f12caa81c236f3…

MALICIOUS

PDF

42.0 KB Created: 2020-11-03 01:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ab74267267dd053fd928180e4bc9db1 SHA-1: 12b9ef35614fed074ca9293bbda5d7bf4480040f SHA-256: 22f12caa81c236f331f343fb30f00ec06c2cc983b9ee913bc9dc276dc2dd152d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm. This suggests the primary purpose is to redirect users to malicious content or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=rpc+computer+definition In PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/3352425.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/rabideni.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/rewelorawa_sukorawelopun_debejimopemebip.pdfIn PDF document text
    • https://negofugino.weebly.com/uploads/1/3/4/5/134529575/2775374.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8276696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3ed8b824-d77d-4dcb-8ae0-abdbdc1e2d28/zibutarur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468e8811-2274-4aac-9bf4-68316aa4925c/82227305274.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/77950677044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e957995-d174-4fb1-b4fe-4d64a1411e13/60308740526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413477da-5634-4cbd-84df-07933688b6b4/literary_criticism_of_beowulf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2163/7035/files/jozimakuzudekorosiveva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7646/6843/files/sewing_tools_and_equipment_worksheet.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_off00005a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0D 4768 bytes
SHA-256: a071d57f872e1a8a959b1061a3cad6554c4883d9b407eabc10a706fac5715af8
font_01_sfnt_off00006a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2A 10340 bytes
SHA-256: b7cf66a6235b6e1a5f6416b96642525bae2eb9057908b3d009f4dd7f411da8c6
font_02_sfnt_off00008d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D96 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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