Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d72f00f2a63689…

MALICIOUS

PDF

67.2 KB Created: 2021-02-20 12:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 39793481fceea46f462e9bc6f5126702 SHA-1: 99a0a8fb5718e9aa34d4d8c35ea0e670a69c6e83 SHA-256: 55d72f00f2a6368962b9e3efe6d9b7b94679f97407ffe11f1198716b4b86033c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/wix?keyword=mercury+manual+trim In PDF document text
    • https://cdn.sqhk.co/nuwezomu/iMihjjr/cuballama_tienda_online_celulares.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6002ea74f20f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fdc08ea12772.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/iabXNiL/my_boy_gba_emulator_full_apk_free_download.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/tigof.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/kesefewa_sotizivobuximo_mibizadabokulep.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/VGhhbhi/18602097527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fce9cbe93499.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/ghTnIhb/87706440499.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/i9ghBVp/tuwuxekuvakaralukegudito.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/gcjicwz/rebuild_of_evangelion_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/gjhgjgc/vofexalivojemaguwizub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_602b089532583.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/jjbgcJT/youth_hockey_teams_in_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_5fd7c27560b88.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/wifukedot/pudorekirivawalelonov.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/nalolana.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/alfabeto_espanol_worksheet.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_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 4876 bytes
SHA-256: 8302af4f863aac5aed850badd7f20ad7040c0ba7f2c324cd246e5c0229439fd0
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 10436 bytes
SHA-256: 7ad4371e2b9b16501d57e63d55ba30973dc4b65cf92e4f721263b6c09034ed68