Malicious PDF — malware analysis report

Static analysis result for SHA-256 f675d4c0068b057b…

MALICIOUS

PDF

89.8 KB Created: 2021-02-21 12:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4552b7de2f9f125693bc151d204bfe1d SHA-1: 93a381d1416165c1f655c13538f9f1fc702093db SHA-256: f675d4c0068b057b91c2928e359abc5296c164af6422b6cda1ef86ee4df6d594
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely intended to trick users into downloading malicious files disguised as software or handbooks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=hero+hunters+mod+apk+2020 PDF link annotation
    • http://marinarus.space/perry_s_chemical_engineering_handbook_9th_editionrmrlg.pdfIn PDF document text
    • http://copyrightviolationcenters.com/soforujisizubetoh0oyg.pdfIn PDF document text
    • http://poradoit1.site/69639946953tk774.pdfIn PDF document text
    • http://prizinsta.online/cambridge_english_for_engineering_answersp1qz2.pdfIn PDF document text
    • http://re-capital.ru/citroen_c_elysee_2014_manualjwgk2.pdfIn PDF document text
    • http://diletemofuvufu.22web.org/3701967886.pdfIn PDF document text
    • http://tk-pobeda.site/97863382947b2jh9.pdfIn PDF document text
    • http://whitetwo.space/muxitotoeq9.pdfIn PDF document text
    • http://organize.shop/nikuruzedululabaxevmu17.pdfIn PDF document text
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/lifezipesukelosoriv.pdfIn PDF document text
    • http://bestrongbyg.com/fafuwexinexozahvk3.pdfIn PDF document text
    • http://study-english-04.space/niwurogiduru0y3pp.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/bagisi/christopher_martin_cheaters_prayer_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/gk_questions_and_answers_for_class_5.pdfIn PDF document text
    • http://muvizedo.epizy.com/savalafeba.pdfIn PDF document text
    • http://pidesinuzi.rf.gd/aflac_accident_policy_claim_form.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012a00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12A00 26580 bytes
SHA-256: d99c82dfa7ba77aeb8fa27d35ce2070e4ba461d411045fb0da2da8beade658c5
font_00_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5468 bytes
SHA-256: 7410a36cddc24afaf243b2fbdd45b6557e94444cac32062b8ee625bbfa1e9810
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 1932 bytes
SHA-256: 79146b382a30d57b86cd31aee382fdde8e94a7721889692ffed962feefcb06eb
font_02_sfnt_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 10360 bytes
SHA-256: c41254909cd39ee5a6ab0e83d9d0d9cc23c93e1f77c5fd3cb4c974e898e4c97c

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