Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbcdc0bf839cdbd…

MALICIOUS

PDF

79.0 KB Created: 2021-04-02 16:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c192cc494f5696fd6a89a3dd52854e43 SHA-1: 9783b561761a1a9a81b31ca3dd6441ed4c0132da SHA-256: 0cbcdc0bf839cdbd47348cfbde10f9256f76a9bddf2e26f3fca938d5a51b4b54
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=cambridge+dictionary+free++for+mobile PDF link annotation
    • http://misujupino.getenjoyment.net/rconcilier_l_islam_et_la_science_moderne.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/6WXUeif/animal_crossing_ds_fish_guide.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/9834117.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/gevutozupovet-gerizajopexurum-polovaritel-taraj.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/76513618254.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/oicknhc/bertram_fiddle_episode_1_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/cGugctS/darksword_armory_ranger_sword.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/FJylic2/qu_you_app_android.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/425437860.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/atomic_structure_notes_for_iit_jee.pdfIn PDF document text
    • https://cdn.sqhk.co/rezejigobip/fFjfyha/79693902288.pdfIn PDF document text
    • https://zamomojufowa.weebly.com/uploads/1/3/4/6/134613680/3623292.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/jdXhdzN/4_immagini_1_parola_soluzioni_6_lettere_cro.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/iajifbw/stick_tennis_england.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/jde2Hge/putiwuvibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekomuvave.myartsonline.com/how_to_use_google_docs_powerpoint_presentation.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/9093015940.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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5308 bytes
SHA-256: 1c1e6fb494e642c9540ecc1ebd8e8dd07d61dc55ebaa1f6e09555234d47204e5
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 12096 bytes
SHA-256: 27608c6839d39cc7e0fd9925784d34bcbab69a73cda9a9b9bd272ec75c0fe5c3

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