Malicious PDF — malware analysis report

Static analysis result for SHA-256 0316e7e4df8bda5f…

MALICIOUS

PDF

79.3 KB Created: 2021-02-13 18:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dfce7178d9ec204c3682d583a4065095 SHA-1: 998cfa7b1248c3db77d0857c432efe5d8915143c SHA-256: 0316e7e4df8bda5f912ff790c9beb6871fd57f5a4cc62a64bf5b539b91e7de69
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute traffic or host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=13.3+special+right+triangles+answers In PDF document text
    • https://cdn.sqhk.co/legezuseg/jj7tjiP/mijonigikaguri.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/biWsmZp/dodiwidimunepemevezege.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/hk8ihgj/play_worm_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/g8Rjggh/muwofogumoba.pdfIn PDF document text
    • https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/rerip.pdfIn PDF document text
    • http://andyhong.blog/ielts_vocabulary_boosterba19a.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/S47gdji/medilifojikono.pdfIn PDF document text
    • http://walletelectrum.buzz/mortal_kombat_trilogy_n64_emulatorpxjjg.pdfIn PDF document text
    • http://filemarker.store/kogepazepusogatofajopodabmee90.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/d7jf7zs/12610619632.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/jxnSZic/dafepemosozenazu.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/vujujijixikekon-kiwozowe-buvunixalubud.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/jajoxulabojaso/87944349211.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/jovumerovurisusa.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/bible_names_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/jomedixokufupadij.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/21237275717.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/kelatinepavare.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/68459185254.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5440 bytes
SHA-256: 6161fc925638806cdd6d2abbfe35fcba389d0fa272df62ce61e6609f263927c6
font_01_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 10320 bytes
SHA-256: d38ca3861d748ce718f6f90094aad80abc0cf96162e46fdd5ae38a6af771ca2c
font_02_sfnt_off00011aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841

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