Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d17341d4bc5c5f…

MALICIOUS

PDF

78.6 KB Created: 2020-12-15 22:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e84281db1c8f0ac783466eef7d0dd85d SHA-1: bb181306a793183c21e5e41807236908a6049078 SHA-256: 33d17341d4bc5c5f1f6f9581f75fd2a7c693f4b97905193c7f06fb42bc0ce4c1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, disguised as an offer for free online series. This indicates a phishing attempt to redirect users to potentially harmful content or further malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=watch+series+free+online+apk In PDF document text
    • https://kurasapar.weebly.com/uploads/1/3/4/9/134902571/1165272.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/fegukarolub_petipupali_karisuvujupolif_piderarijedigaz.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/bapapevobuvezotame.pdfIn PDF document text
    • https://wojasatog.weebly.com/uploads/1/3/4/7/134765175/nurek_saluxotit_suxoteramafa.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/givuvidujakaw.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/wavatowerujipip-puruxamanufod-pidobuset-wadopudilug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc37cc05e8e827d429e4280/t/5fc5ebb63c6ccf69f32bb14c/1606806455634/kopijusa.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/lion_air_plane_crash_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75646649-f24c-40e6-8439-b85d3176c9b9/34394720398.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/tuzowomoderesixosaraziv.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/general_appropriations_act_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7eb7bfc-3178-499d-a915-b9180a9013bf/cub_scout_sunday_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9e2bb6-c495-4e5a-9ea3-ba7f83d7732f/4006026860.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc65ac32cf09257bd909f09/t/5fd695f5d654060362d02434/1607898613797/72275923493.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_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 5180 bytes
SHA-256: 98336eeba3fc19ecc99cd61e4c77138cec765b284a28134e739c9de1e7c00e82
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11468 bytes
SHA-256: 849aea50db387fcfd77e873679c5035ebdc9de9dadc078de8f99ae854060f1ab

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