Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2eb474a927d0e5…

MALICIOUS

PDF

75.1 KB Created: 2021-02-22 23:20:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 76412bbfef1a9be3246a619fbad03fe3 SHA-1: 93a7a8fc520295f86b92d7aabeb8a2a7bb23269e SHA-256: fd2eb474a927d0e511b9feed7da939745e8b5e7d829f2ab829dddbd8cc4bf405
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or lead users to phishing sites. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious distribution mechanism.

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/wix?keyword=8+ball+pool+mod+apk+anti+ban+unlimited+coins PDF link annotation
    • https://cdn.sqhk.co/lanuniwa/QDPgjaD/omega_street_fighter_4_tier_list.pdfIn PDF document text
    • http://bavomobes.22web.org/em_18_reader_module_datasheet.pdfIn PDF document text
    • http://dagoseguvidita.22web.org/577160132.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/d3aa3f983bce73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428052/normal_5fe420709a5e5.pdfIn PDF document text
    • http://ruzunolesar.iblogger.org/checked_formal_pants_for_mens.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/jfyRjiv/roman_numerals_to_numbers_conversion.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/jahhIic/bike_race_free_mod_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/hdlhbhj/school_days_movie_cast.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/8b45f7d0370df8d.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/sojaxub/bootstrap_parallax_one_page_template_free.pdfIn PDF document text
    • http://kedekivotizera.epizy.com/juwexemufifugupasalokab.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/kodasupixigupa.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/degif.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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5424 bytes
SHA-256: 55f0b8c0dc4e475481d792450c31d8fd48cb398ef9a3a2bcd261b8a72706eac8
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 14864 bytes
SHA-256: e625cba762be799a6d4b5ba39504d35b7ba6ea28a3640d281e711a3663cb8cfd

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