Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf981ebc54b9a1e…

MALICIOUS

PDF

83.7 KB Created: 2021-05-03 07:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72a52099e4b735e9c3b24ab1817759ec SHA-1: a7212614799ae2f1d5601ad115badae446ae1d37 SHA-256: 5cf981ebc54b9a1e96c307707f834a3d14d777f0f625f32e0b28481966f80818
244 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. The embedded URLs, particularly those on disposable hosting and redirector infrastructure, strongly suggest a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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/strik?utm_term=the+elephant+vanishes+themes In PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/4203258.pdfIn PDF document text
    • http://onlinesos.tech/ralink_rt3290_bluetooth_driver_linuxig3yh.pdfIn PDF document text
    • https://vozupixog.weebly.com/uploads/1/3/4/3/134312338/3740294.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/e277d17.pdfIn PDF document text
    • http://trysalon.xyz/the_crown_season_4_episode_7_charactersapqs1.pdfIn PDF document text
    • https://xanowiporak.weebly.com/uploads/1/3/0/8/130814060/kilozawazivavasalumu.pdfIn PDF document text
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/relugusuk_fogamid.pdfIn PDF document text
    • https://gososeru.weebly.com/uploads/1/3/4/5/134597059/xasexit.pdfIn PDF document text
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/9222469.pdfIn PDF document text
    • http://ita-bio.space/33983628426wvtj7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorinemoxolupip.rf.gd/academic_performance_synonym.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_3be6f9cf77094b0d97780f52af2d0bc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/303dd433-e20e-43df-8708-d70c5dce2b7a/52068197638.pdfIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_d78bd736bb304788bce1852cff6bec5b.pdf?index=trueIn PDF document text
    • http://risubutiz.rf.gd/aksara_sunda_lengkap.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_09682465190049caad58774258d4e147.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea468b5c-d871-444f-a48d-6a6ea2323ead/lapojeb.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_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 4972 bytes
SHA-256: 2e6aab0517dc9d5c29e25d091640e67b16e4d57604a53a1aed8fa334b48154e6
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 15952 bytes
SHA-256: 052b11ce4285054704a286b8312c99c3e3308e7eac477955ffcfbb11c44b4147

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