Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3dba37d0ea89f1…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 15:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4387b8e7b6043376e19dfe38227492c0 SHA-1: da37d33006c1291ee4d74ab6059ee27500204ff4 SHA-256: 8d3dba37d0ea89f1df2919b14ae88660a69b011d41dfcc916b7b6d6604ba977e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a significant portion pointing to disposable hosting or unknown reputation sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://golowaki.ru/aws?utm_term=dragon+age+origins+companions+gifts PDF link annotation
    • https://cdn.sqhk.co/sevijeruba/1jjhdjh/don_t_touch_my_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/6hdjhkO/2761859789.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/Piehijj/84231958615.pdfIn PDF document text
    • https://denimuka.weebly.com/uploads/1/3/4/5/134582609/2b3b36.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/iaE2ehh/live_nfl_yahoo_sports.pdfIn PDF document text
    • http://ccckkkkk.space/the_grand_grimoire_original4yvhf.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/39511ee98bc7.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/jN9hhjg/zuner.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/bHhhkha/kapalaruremalavofe.pdfIn PDF document text
    • http://winoorama.space/bible_quiz_app_free_download_for_androidk2la5.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/latuguju.pdfIn PDF document text
    • https://cdn.sqhk.co/tumokufagu/ahfH5gj/graphing_calculator_math_papa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/indoor_camp_games_with_no_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/alexander_dugin_fourth_political_theory.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_beae5f00fc6a458f9267a42355809e59.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/41750090879.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_acad0fe66630404091d3df67235d27c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/passing_off_and_infringement_of_trademark.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_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 5304 bytes
SHA-256: 4287fd2824e6799e21f5e7b727a832f33fc5b60c7415ea722d5b106dd9d423dd
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 10840 bytes
SHA-256: a83c97b6488dae741fe7643e3691ec459fdd99fdecad1ccc7bce760a68b44d58

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