Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbdfae6018c15fd…

MALICIOUS

PDF

73.5 KB Created: 2021-04-18 23:40:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 18c646cbcace95a069de4aed8371ac77 SHA-1: cd80791b28e159d6cf95193949b1ca9492113175 SHA-256: bcbdfae6018c15fdb3c3ac2ddb8187fc2a89072e6f21a9bf9456391ccef7496f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=john+deere+lx255+mower+hood In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387421/normal_60051300a80b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_5fe485cd12c04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fdf00ad90694.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/6342129.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/3883863.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/6004106.pdfIn PDF document text
    • http://xutuvulamarav.iblogger.org/what_caused_brown_vs_board_of_education.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/3786515.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/sigor_gozusul.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/zoxawawasi.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/eb19eb1a-c472-4228-8171-7734496aae1a/xipororamitufobujinogimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cae1559-4c40-42c0-946f-9a3c90b68474/gataso.pdfIn PDF document text
    • http://kibuwigukakew.epizy.com/firmware_huawei_p8_lite_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3205e0df-a1bd-4c1d-a044-dedaa81b389e/dejuliwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430710b7-e0d2-4792-8683-04e5175c495a/hp_probook_4520s_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839f423f-0e35-4ecf-96cb-3b4eeadcde02/classical_guitar_spanish_love_songs.pdfIn PDF document text
    • http://tomafidom.rf.gd/zalovuligoruri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be54604a-c68e-4439-bfa3-85a01ccb322e/etek_5_solenoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0319e9-380c-4567-81f4-22feb7b7c343/zupataj.pdfIn PDF document text
    • http://nexaware.epizy.com/blue_prism_developer_certification_dumps.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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 5080 bytes
SHA-256: 1b19c6b899818fb40cac856743eb7858acb0ad1bba618cb4d82ff989ded7821f
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10832 bytes
SHA-256: a6870021f0c17eea41bf1d7a2696cdddc79e2beb1bf8023142ec1192ce29e45c