Malicious PDF — malware analysis report

Static analysis result for SHA-256 803c03528c003671…

MALICIOUS

PDF

80.0 KB Created: 2021-06-06 20:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b5c0f808edc5c79df7634c4f48cb7b2b SHA-1: 0a2ba5b9e9f6f094737d490b9d8e88fc868f3b20 SHA-256: 803c03528c00367135bef5c87c3ee4f4d8979ee25e9894d849ab9de81d2401d9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the PDF structure point towards a malicious document designed to lure users to external resources.

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://chcial.ru/pbw?utm_term=equipment+specification+sheet+template PDF link annotation
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/c315972f20c.pdfIn PDF document text
    • https://daburupolajiwu.weebly.com/uploads/1/3/4/6/134634816/mozoleti.pdfIn PDF document text
    • https://zesuloni.weebly.com/uploads/1/3/4/8/134892945/xuwolowega.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/diwapalazukiz.pdfIn PDF document text
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/df188a4.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/pigaguvagifediv-jerudawoson-fixonugisapu.pdfIn PDF document text
    • https://bobejezesolaz.weebly.com/uploads/1/3/4/6/134622741/47cba8.pdfIn PDF document text
    • https://jakuvuwokuguges.weebly.com/uploads/1/3/4/8/134891264/rewerowijajim.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/6d8a5a2d.pdfIn PDF document text
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/e743577b1fd3f.pdfIn PDF document text
    • https://tefeteti.weebly.com/uploads/1/3/0/9/130969297/wovagepotonu.pdfIn PDF document text
    • https://lisofagan.weebly.com/uploads/1/3/4/5/134598873/davufiwepamafu.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/4e6de4d7f72.pdfIn PDF document text
    • https://kozamewibigox.weebly.com/uploads/1/3/0/8/130874388/4079783.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/kiligopaxad.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/c5b2ec67-a8c6-466d-9872-1305aefceff2/61894656170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05848991-d60b-4148-b4e2-ed41f4b5b297/pavopisipesiwabumufonugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac15bed-85a0-497e-b907-7c9b1cd92a9f/where_can_i_donate_clothes_in_nyc_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9820ad5b-6977-48e6-88d3-c47ad34ed34e/common_core_math_standards_california_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892bfcad-564c-44d8-a74e-ff13d0479215/free_download_key_root_master_1.3_6_apk.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_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 5240 bytes
SHA-256: c7d1b2d804f2b15ded97eb77f10a8433b9e51d564cbc2ef9a22868bc5e496f05
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 10880 bytes
SHA-256: 5afc381ce950ffd30e5cc34fbf1c01d82be7a615a20201308be85857b909da48