Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c54ccfa0a3da7ca…

MALICIOUS

PDF

79.4 KB Created: 2021-06-14 07:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: eeed593fc117d56a6ab34ab517a4abdb SHA-1: 69f77051536576bdc86e7b3602e6d983bb76bed1 SHA-256: 5c54ccfa0a3da7ca9f81b8f81f14f0fa4a3b3cb0423f7152b5b11739311fd780
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the 'Endoxan drug information' text suggest a lure to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=endoxan+drug+information PDF link annotation
    • https://vuvopovakufusoz.weebly.com/uploads/1/3/4/3/134342968/pozejaluk.pdfIn PDF document text
    • https://bifitulodagox.weebly.com/uploads/1/3/6/0/136081839/pujipowomojapu-refatapim-pazurarug-movakinuludimi.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/3880102.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/5591286.pdfIn PDF document text
    • https://didipovewefof.weebly.com/uploads/1/3/4/3/134306756/8adcfe65.pdfIn PDF document text
    • https://wevepoguf.weebly.com/uploads/1/3/4/7/134717949/7c65b0136849.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/a793efb91a34f7.pdfIn PDF document text
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/653cd16076114a.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/7755d.pdfIn PDF document text
    • https://xarojitoma.weebly.com/uploads/1/3/5/3/135305856/lekow_soditeronozaga_dizuram.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/9377223.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/mofuloxutotepeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fa1180-c7df-4996-950b-9aae05bddb62/91665938235.pdfIn PDF document text
    • http://povelin.pbworks.com/f/geraxizebudapadopurenoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e047c8bc-93f4-453c-9372-98ab9c5fa5b0/the_firm_nas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0038c835-1949-46dd-ad81-29e2e75afcd7/90523131284.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/how_to_connect_tv_satellite_and_surround_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0920fda-5f04-4c94-bc16-f0b74ba48b46/54921027045.pdfIn PDF document text
    • http://lowigamivux.pbworks.com/w/file/fetch/145254894/5263376031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d564264-4d70-4898-987d-f8acb468a199/icom_ic-207h_for_sale.pdfIn PDF document text
    • http://tuxowojopugo.pbworks.com/f/pst_jst_jobs_in_sindh_2021_online_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637964c3-d50e-4f09-807a-c2c3537e4cd0/64976676762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97da6377-ff7b-487e-86ee-380f366be6d2/fakupokaxugelivexemerid.pdfIn PDF document text
    • http://dudatuj.pbworks.com/w/file/fetch/145268346/zigataritemup.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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 5040 bytes
SHA-256: bc23f13503a6e9647291a5526b1f1b5675a3bf1650bcca7d62af7bac916a3d5d
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 11188 bytes
SHA-256: 803a883bf637ffdf73b8acfebea2c000f293332e2226c24a0080d39225a9196a