Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2db79dc58900c07…

MALICIOUS

PDF

71.3 KB Created: 2021-01-17 17:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 545d1df21ce161e7e9872ffa7088475d SHA-1: 5ddf9682e1457e3f6a51906f2e5326123995220a SHA-256: a2db79dc58900c078ff902f9f0ef32ec279215251224085757199fb132f53915
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://trafffe.ru/123?utm_term=buffalo+bill+dance+meme PDF link annotation
    • https://site-1175933.mozfiles.com/files/1175933/tubers_life_simulator_mod_apk.pdfIn PDF document text
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/5157a1d56.pdfIn PDF document text
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/1733502.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/gj1Kgif/ky0_z-_tune_silver.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/DLdifgf/get_likes_on_instagram_app_download_android.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/tipix.pdfIn PDF document text
    • https://cdn.sqhk.co/xizubutagen/PXgcDgi/graphic_designer_job_salary_in_dubai.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/gilitanokani-gujuwijes-fakefexalelimo-muzedagix.pdfIn PDF document text
    • https://site-1196795.mozfiles.com/files/1196795/best_books_2020_uk_richard_and_judy.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/jdjigus/nintendo_switch_online_store_refund.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/pevoleninivoxokenani.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hfji3VU/xegavod.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/7296246.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/love_rosie_ending_explained.pdfIn PDF document text
    • https://site-1175702.mozfiles.com/files/1175702/marketing_plan_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/hR0jeG0/donulasubekipekuwotowosa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://repibikapowa.epizy.com/tuxujeregix.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 5080 bytes
SHA-256: 1ef2303612e737247b9e4551f2d1728b3a9ec90bd4e269a268586bdb6d1d9e93
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10672 bytes
SHA-256: 43854b6d31244b20ddd298ff6130241ae9a2033769a2bef12e7393a0a018ab42

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