Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cd0a10b79686b9…

MALICIOUS

PDF

71.1 KB Created: 2021-02-20 04:25:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e894716e416c8f67d3aacfc4926b1df SHA-1: eb7f46d1d30951b97d17bd84895d8bcce79378ce SHA-256: d3cd0a10b79686b94db8cf09ba66d8efc11f0bd5d9d3bdb5417f67882757ff2e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO spam or to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wb?keyword=is%20the%20story%20of%20billy%20elliot%20true PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418166/normal_60182c3ed22b4.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/b554f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ffca4b08fff5.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hhnrVbB/699180692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464052/normal_6029f7101e45d.pdfIn PDF document text
    • https://cdn.sqhk.co/nosisatoved/d1Iiggj/disney_world_animal_kingdom_list_of_rides.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/dJ7gdhi/how_to_read_music_notes_for_piano_fast.pdfIn PDF document text
    • https://kudarori.weebly.com/uploads/1/3/5/9/135960502/rupadokexeseg.pdfIn PDF document text
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/medirojuliv.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/kemeboxibe-muretijer-wumerexebe.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/jcGQjh3/23815845753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_5fda7637158ee.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/zomikax.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/gg57hih/special_olympics_logo_transparent.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subutolibi.rf.gd/biratexev.pdfIn PDF document text
    • http://xaginebosujaj.rf.gd/hd_abstract_wallpaper_for_android_mobile.pdfIn PDF document text
    • http://jemekovivokuvup.epizy.com/absorption_costing_and_variable_costing.pdfIn PDF document text
    • http://babijegogaluz.epizy.com/51247860321.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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 4824 bytes
SHA-256: 6481b9e9e4942d551d255ff7e044988ff673dfbb12a3a80e5ee957bdaa7130c6
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10736 bytes
SHA-256: 9483b21bc8609dc9de0b5e3a213c1c05204d58ed33a68bca04d5754c7dae7d24

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