Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe21315f306241ab…

MALICIOUS

PDF

81.7 KB Created: 2021-02-14 13:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756591dce92f6ef2228bf2f4e13f3487 SHA-1: 44df612aa08536c471983ed1b6c96bfc45e3de7f SHA-256: fe21315f306241abc79de1b50afe571e8d23fcc37c692f866c2ed7fbfdcb2d19
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://leonvi.ru/123?utm_term=the+young+elites+adelina
    • https://cdn.sqhk.co/tuvameboroke/g4hhhdC/47617461708.pdf
    • http://lumurezekosarew.66ghz.com/54646153872.pdf
    • http://zenarajare.22web.org/nefixojug.pdf
    • http://ogranicbio.fun/vanogofoxekabiwajabanikusvimfo.pdf
    • http://skidki-day.shop/financial_accounting_10th_edition_robert_libby4z8rb.pdf
    • http://dkmz2.club/24395125193bzbvo.pdf
    • http://neluvukod.22web.org/62731106847.pdf
    • https://cdn.sqhk.co/kizulajeli/ig9ghhi/fijagekolone.pdf
    • http://ig-soft-team.com/38378508782oijvh.pdf
    • https://cdn.sqhk.co/surodamiz/agemJgh/dadok.pdf
    • https://cdn.sqhk.co/puroneruk/jaYbxhf/dosedo.pdf
    • http://ragukir.iblogger.org/utorrent_pro_apk_free_for_pc.pdf
    • http://unityfree.xyz/64537951332vl5t4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kejidexod.epizy.com/16097162961.pdf
    • http://kesotufujurox.rf.gd/wiwobenifinubikatibasabu.pdf
    • http://wazamogonobovox.epizy.com/gogopozifodu.pdf
    • http://devugagevubuz.rf.gd/31258475482.pdf
    • http://pixuxurarosu.epizy.com/kodowufire.pdf
    • http://jisixapuwalim.epizy.com/capstone_headwaters_hvac_report.pdf
    • http://xifudovolamam.epizy.com/africa_acrostic_poem_worksheet.pdf
    • http://jufakoxageponuz.rf.gd/staples_simply_white_mailing_labels_template.pdf
    • http://dusozizogotudim.epizy.com/bejeweled_3_full_free_for_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e8.bin
5e60dc548be43e48c1903012bffea47102407ca37afa12c866e2224739c698a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 5040 bytes
font_01_sfnt_off00011418.bin
ddd51a0ba83b14389c647c5deb7cf4137c26befa376d7437aed853d5e9545614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10968 bytes

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