Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621b438977c0882…

MALICIOUS

PDF

62.9 KB Created: 2021-02-13 15:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 5038258b26a66ad5e03d39d8d2a5f709 SHA-1: 52e4a08788fa5382ea6518ef7f0904aceebdb705 SHA-256: c621b438977c0882d47ccb28444fe6d0d925609fee326bbd439ea5522fa5733e
254 Risk Score

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
  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?utm_term=shaklee+basic+h+uses In PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/gofitapuvaza.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/xexipemus-nigofet-nidotajinigi.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/7904197.pdfIn PDF document text
    • http://1ux.site/supposed_to_mean_or_suppose_to_mean0kzxz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408002/normal_5fda493708b86.pdfIn PDF document text
    • https://gixebufenof.weebly.com/uploads/1/3/6/0/136082423/6505693.pdfIn PDF document text
    • https://xelexezeni.weebly.com/uploads/1/3/0/7/130740222/7209348.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/jitunip.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/1472165.pdfIn PDF document text
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/6079608.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/rizezobabub/aviator_watch_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/mining_leveling_guide_ffxiv_50-_60.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/disable_submit_button_reactive_form_angular.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/boyz_2_full_movie_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/unikey_cho_may_mac.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_off0000bbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCC 5096 bytes
SHA-256: c6d63015e90e028291fc96f80e26384051c602d178cbb1a02035d093528db962
font_01_sfnt_off0000cd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1C 9968 bytes
SHA-256: 76f65104eb40f0657e21e94c8797c01d274348ebd9b5792a35f9d7d0d875c7ae