Malicious PDF — malware analysis report

Static analysis result for SHA-256 304bb37c5035c13b…

MALICIOUS

PDF

72.9 KB Created: 2021-01-11 07:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fdde692f09c8641b6ff63270492cc668 SHA-1: f8d97ca19900bc4547d8b92b5b2e454d30ce6c1d SHA-256: 304bb37c5035c13b10ea3ac96d9895c9d20a8054a4d46e53bd8bba1586d40776
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Salesforce email template with attachment'. The presence of numerous links to disposable hosting and potentially malicious domains indicates an attempt to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=salesforce+email+template+with+attachment In PDF document text
    • https://cdn.sqhk.co/vexapalas/07hdRAd/94659107696.pdfIn PDF document text
    • https://cdn.sqhk.co/rebibenizuj/cLCrPjj/skylanders_ring_of_heroes.pdfIn PDF document text
    • https://site-1204767.mozfiles.com/files/1204767/car_driving_simulator_drift_apk_mod.pdfIn PDF document text
    • https://giretalude.weebly.com/uploads/1/3/4/6/134677333/7288497.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/7JxO14r/chatham_kent_emergency_department.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/bokaro.pdfIn PDF document text
    • https://site-1166068.mozfiles.com/files/1166068/patwari_syllabus_rajasthan_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/1W7HsQM/zarujogewikazob.pdfIn PDF document text
    • https://depatimuxuzox.weebly.com/uploads/1/3/4/4/134404048/zenes-muteweza.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/gNggjaQ/best_mma_fighting_game_ios.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/6133640.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/3ecc2298a.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/fikuvine/dodaralesebumavawe.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_off0000dea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 5452 bytes
SHA-256: 865fb9d14cfd9f3c5bc70a19d98b035273ec5daea9a6e1f923a246524a866cdf
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 11012 bytes
SHA-256: 747bd45aa3c0cf3512743e8121bdaab3dee052e9838b05292316687c2c503318

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