Malicious PDF — malware analysis report

Static analysis result for SHA-256 655d8fd191518e7f…

MALICIOUS

PDF

136.9 KB Created: 2021-03-02 08:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f50e6240ce08deb2ee7a35fe8950c4d5 SHA-1: 54cea57f5b65964d1007c2512a89ed46419d5885 SHA-256: 655d8fd191518e7f1ecfced91ef3cad2a6033721a59cea21ea66cabebd9a284d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the structure of the links, including UTM parameters, are consistent with attempts to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/strik?utm_term=what+extra+books+does+catholic+bible+have PDF link annotation
    • http://ru-dev.xyz/easy_guitar_tabs_for_beginners_acoustica3g56.pdfIn PDF document text
    • https://sejukato.weebly.com/uploads/1/3/4/0/134018084/4342414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_603d768eab33c.pdfIn PDF document text
    • http://fashion-deals.xyz/16494987765dd17j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_600f2f614f17d.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/sakamegamuzizexodafkhsz.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/87ac0bc93e.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/girepu.pdfIn PDF document text
    • http://nupubidodeje.22web.org/70157521154.pdfIn PDF document text
    • http://kernig.store/relative_clauses_worksheet_tes5coo4.pdfIn PDF document text
    • http://creditscorefix.info/past_tense_in_englishs4u9a.pdfIn PDF document text
    • http://mnatural.space/how_to_get_my_act_workkeys_scores4u53b.pdfIn PDF document text
    • http://smartcreditscore.info/dog_man_book_7_read_aloudiya6j.pdfIn PDF document text
    • http://mon-cmbretagne.com/sap_business_one_accounting_moduleabej3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rolozipufulelo.rf.gd/xizekedowevakizopeli.pdfIn PDF document text
    • http://zaniwemikadas.rf.gd/samujumofujuno.pdfIn PDF document text
    • http://vixekufu.epizy.com/68077919344.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B400 9512 bytes
SHA-256: 0aa68aaeb8917212aa727709e80d7208482274c05aecd9d12b193e06cbbfa218
font_01_sfnt_off0001cd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD11 5372 bytes
SHA-256: 5434f1303138f27830d23593fa832e9ab0f8fd209b9c3b11c528fdf155b94aad
font_02_sfnt_off0001df61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF61 17592 bytes
SHA-256: acf420f9ea41fff0ea6d39c938fe78c4f7a4c11874688eb07e6a9bb274f145ae

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