Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dd3141aa3f7832…

MALICIOUS

PDF

175.8 KB Created: 2021-05-28 20:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddc1b6046590feb1e5e95f4d81c0c9c9 SHA-1: 75f4c15444f1bfe14fd8700473257a68f2336ca2 SHA-256: c1dd3141aa3f783221f21e7d2addf9d81e21a589ad7967976617eb5fea9f1594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It utilizes a link farm strategy with numerous disposable domains, suggesting an attempt to distribute malware or phishing content. The embedded URLs and the heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=developmental+biology+gilbert+9th+edition+pdf+free+download PDF link annotation
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/poraranesi_xukotutelaz_sobilux_besilagukizeb.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/wujulumotiwumir_welatugiwejox_dadiwajimimibas.pdfIn PDF document text
    • https://rojilijeliw.weebly.com/uploads/1/3/1/4/131409822/3309046.pdfIn PDF document text
    • https://musejeruz.weebly.com/uploads/1/3/4/7/134740211/kikozejutowine.pdfIn PDF document text
    • https://bikepudebap.weebly.com/uploads/1/3/1/4/131405977/a07588a24.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/9192676.pdfIn PDF document text
    • https://fifosekula.weebly.com/uploads/1/3/4/0/134041306/pepopavomet-zinati-tililivujatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_6050d6c570c46.pdfIn PDF document text
    • https://golurivuj.weebly.com/uploads/1/3/4/7/134744385/1078529.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_6005bd59f2934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fd181135b6f5.pdfIn PDF document text
    • https://sunotutosa.weebly.com/uploads/1/3/4/4/134402565/werawon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486368/normal_6019c6a5283ee.pdfIn PDF document text
    • https://nilumasukezag.weebly.com/uploads/1/3/4/4/134401113/tizumabobitete.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/1e97e9eb-eb2e-49c5-9679-8c3b3681d015/wheat_belly_book_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39921dca-93d0-462c-bcaf-01ac8d8d0142/tawivolabavaxuvus.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_off000271b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271B0 5828 bytes
SHA-256: 01c7de697cb6511b9cf813561ae8b6b5049e1eb194563e7ed0d2451eb12fe36e
font_01_sfnt_off00028576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28576 12296 bytes
SHA-256: 43a1f93a46bb6e40e6bb7d96e3a194ff9d3d9586f41f0f1c0005fd8bd3325ee2

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