Malicious PDF — malware analysis report

Static analysis result for SHA-256 671daad856031b02…

MALICIOUS

PDF

73.8 KB Created: 2021-02-12 13:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 53cb05b98607dc3a606b36d67c524904 SHA-1: 7265a6282832a337358a5a872f1621e3349696a7 SHA-256: 671daad856031b02156148c80e87b1147b260503d48211ddf71a88dc78cd7e96
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/wb?keyword=dallas%20cowboys%20party%20invitation%20templates In PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/8443ea571d651.pdfIn PDF document text
    • https://nejaxadutoxukax.weebly.com/uploads/1/3/4/6/134622523/cc36dad3b80b957.pdfIn PDF document text
    • http://khareedforosh.com/free_loan_agreement_template_ukh5var.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/gemarefekawim_malopemanaz_zukales.pdfIn PDF document text
    • http://cadenalia.com/la_chartreuse_de_parme_chapitre_35emck.pdfIn PDF document text
    • http://gufutaca1.xyz/9397750070ew9mr.pdfIn PDF document text
    • http://wide-do.top/get_rich_carefully_redditc6wb8.pdfIn PDF document text
    • http://meetsoda.club/78712816450o4xjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477147/normal_600a7bb0dff47.pdfIn PDF document text
    • http://oneitstore.info/world_of_warcraft_soft_toyv97z7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_601ead2164703.pdfIn PDF document text
    • http://greyfruit.space/volume_booster_sound_booster_music_eqpcwlu.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/nitatotol/online_timer_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/83515894173.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/telugu_movies_2019_hd_mp4.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5472 bytes
SHA-256: 1b329e1e0e88f230390292e05b9b7c4517108769e91355352160e26f6014393c
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 10944 bytes
SHA-256: 4356c41a13e39c21191fddf3ef94e4018f065ddf35f1074ce97c147e19879a6e

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