Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cbb48d167d0316…

MALICIOUS

PDF

71.7 KB Created: 2021-01-15 00:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 085162b63c223db116a928faefdd9b01 SHA-1: 737c162203f7a3ec6fcdfad63c766ad85392c23d SHA-256: c3cbb48d167d0316c16c5fa05de91c46a0bf9416c97531e4d780d252bb507d4b
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, many of which appear to be part of a link farm designed to redirect users. The presence of a malicious redirector URL and ClamAV detection strongly indicates malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/123?utm_term=castle+worksheets+kindergarten In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_5fdc3e10a3d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fb97cf753d46.pdfIn PDF document text
    • https://site-1241720.mozfiles.com/files/1241720/minna_no_nihongo_1_workbook_answers.pdfIn PDF document text
    • https://site-1247006.mozfiles.com/files/1247006/capitulo_4a-_3_core_practice_answers.pdfIn PDF document text
    • https://botamelojobowi.weebly.com/uploads/1/3/5/3/135344227/6f5ce98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fb040fbc2d35.pdfIn PDF document text
    • https://doxuvufunufake.weebly.com/uploads/1/3/0/8/130874670/solumenawonu.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/sumadolewe-goganipodit.pdfIn PDF document text
    • https://site-1168528.mozfiles.com/files/1168528/cumulative_standardized_test_practice_chapter_12_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f98f3e4e2b68.pdfIn PDF document text
    • https://paxobafu.weebly.com/uploads/1/3/4/6/134697986/lekukawixire-pugomevosifud-donariwakovat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajujiju/mama_said_lukas_graham_piano_sheet_music.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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 5148 bytes
SHA-256: 27b587e34116cd0a6807bd88f5ccf4869e0415fbbab7589de62712fdb0b2271a
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 11180 bytes
SHA-256: c9c547e645f448a20b1e8a1850dbd813db1cce6be373005ff39187e39e254ff2

Open this report in the interactive analyzer, or submit your own file for analysis.