Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55c9c32b1a17ed4…

MALICIOUS

PDF

81.3 KB Created: 2021-02-18 00:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9d55c26e674350ff001de03d905e6568 SHA-1: 5f8567d64236472354dea360d3d4c5bb11dd3554 SHA-256: c55c9c32b1a17ed4b95a82fd647fd666596c8c2961ffd785d363e5e1e7cb3cf3
244 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL containing 'dell poweredge r510 server drivers download' which redirects to a link farm. This link farm is hosted on disposable infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious, aligning with the ClamAV detection of Pdf.Phishing.Trojan.

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.
  • 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://crophysi.ru/strik?utm_term=dell+poweredge+r510+server+drivers+download In PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/zonemiladijisarim.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/bibYqEH/jewujonokinamiteletati.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/6954320.pdfIn PDF document text
    • https://cdn.sqhk.co/gatavazer/jgQfKom/drum_set_for_sale_used.pdfIn PDF document text
    • https://cdn.sqhk.co/nagubeze/fNicKBU/city_racing_3d_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WJXm8oq/82792594674.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/gdu0Wvy/xuninaxadagubuxebewuz.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/muzaxobifupixuw_dovewokegopamo_jidadirizumunox.pdfIn PDF document text
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/nijonorepebidapaxago.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/c2hbZN0/neon_game_room_lights.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/a9c5f2ff2d28.pdfIn PDF document text
    • http://dixunawizodel.iblogger.org/android_app_to_play_chess_with_friends.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/33823841432.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/class_11th_admission_form_2019_chandigarh.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/aerial_fishing_osrs_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/15730999972.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/oecd_report_singapore.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_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5596 bytes
SHA-256: 824794c7af7eb14bb254fa6378e4b7560a083c5c11b4f90ee4b52ec1ad7cd414
font_01_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 11180 bytes
SHA-256: 91e729f482d96d078ed0fa18839907890dc0ed49bb361b4574b393976a9afb7f

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