Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbb1809aed93c05…

MALICIOUS

PDF

84.9 KB Created: 2021-02-09 21:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 242555e7e65908693a655741d4313db5 SHA-1: 1e92b16059dc22837810b48b2121e20705c6138d SHA-256: bcbb1809aed93c05faf4555a287e529e099e8cefb511ad15287a259230c1f0ee
244 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a malicious link farm, containing numerous external links, with at least two pointing to known malicious or suspicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure itself is weaponized to host and distribute links to potentially harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=lifetime+fitness+centennial+hours In PDF document text
    • http://cardioactiveuficiale.site/sinapuposilifej63q7r.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/gih5n5X/rainbow_snake_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ghXLSia/premiere_theater_cloquet_minnesota.pdfIn PDF document text
    • http://wekifojedopike.22web.org/febedoloborofutawetofudow.pdfIn PDF document text
    • http://redita.fun/suzuki_vitara_2016_user_manuals0jyv.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/wigana-nujeduwikomeji-pulizej-divegimaj.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/fedeb_tesazisajukebug_dikipupawap_zemabimozu.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/4404441.pdfIn PDF document text
    • https://fetubuka.weebly.com/uploads/1/3/1/3/131379928/wupirewed.pdfIn PDF document text
    • http://totalcreditreport.info/atal_pension_yojana_application_formnit94.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/kaxetidob_xamapusivaro.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/fjeMgj5/caponata_de_beringela_panelinha.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/euhiiiN/amtrak_car_train_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tididesonorevo.rf.gd/budget_2019_malaysia_bahasa_melayu.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/balegesubez.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 5064 bytes
SHA-256: 188e879dbef43ad09fd74b20f6046c0dca6dd0b886e67f629dea0323df8a27da
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 10980 bytes
SHA-256: 1971ee6755434244618f4d135bc7dff3b904e62e53b9952116ff29b149b605ec
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 16176 bytes
SHA-256: c16373bf6dfbd7b9783ea8ea101a02cec618568b734ea643a6ef0820380ba589

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