Malicious PDF — malware analysis report

Static analysis result for SHA-256 c685c3959e209b9c…

MALICIOUS

PDF

70.0 KB Created: 2021-03-03 07:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 81c3e300aec4127acc877544e552e7c2 SHA-1: c860b57c0232197a028a707bd02b3568f664be20 SHA-256: c685c3959e209b9c6e3f6e96e0bd891a8e5ab7cd90e26bee2f588b944b781a11
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 hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise or information theft.

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://resalured.ru/wix?keyword=laser+gloves+uk PDF link annotation
    • https://cdn.sqhk.co/riketumes/QgjjdI0/walking_dead_final_episode_recap.pdfIn PDF document text
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/tenud.pdfIn PDF document text
    • https://busaluvugisegiw.weebly.com/uploads/1/3/4/3/134368440/bakobigopopuf.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/tejorobuxej_bisagerikinexer.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/white_boy_shuffle_song.pdfIn PDF document text
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/3567426.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/how_to_pair_roku_remote_to_panasonic_tv.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/8887733.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/how_to_find_wps_pin_on_brother_printer_hl-l2370dw.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/g0Yjjp1/risk_probability_vs_impact_matrix.pdfIn PDF document text
    • http://segwaywheelchair.ru/jogegelojupefusiab.pdfIn PDF document text
    • https://cdn.sqhk.co/piwojosexaja/ghghr6z/pictoword_level_510.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/mipalexapojolupovom.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/zamapowemet.pdfIn PDF document text
    • https://femesizexib.weebly.com/uploads/1/3/4/0/134018571/efc63e.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/nwn_ravenloft_module.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutepotazor.onlinewebshop.net/how_to_repair_a_wine_cooler.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/40411383570.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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 4916 bytes
SHA-256: 65e762c0275ff10b24c5afe5e3a4ddf3b347f9d68f17b2e2ea5b36012d88870a
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 10080 bytes
SHA-256: 1d8ea27864baa73fe5b28b85302400a4a5f1f86f9562fa0da93fa88d06e733f2

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