Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3bc53ee39fdd30…

MALICIOUS

PDF

74.3 KB Created: 2021-02-04 05:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cf8d4106f8cfbd1023c1e8a32b655d28 SHA-1: 305a9e88ce1dadd19bf8bb52497773f675a380b4 SHA-256: bc3bc53ee39fdd30537b7543abce0abac8b8c76e016947e7053b2d57d0b84c48
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'free template', likely to entice users to click the malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/aws?utm_term=free+one+inch+graph+paper+template In PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/1a4e0ee8.pdfIn PDF document text
    • http://micrometer25bill.site/holt_algebra_2_california_textbookvm3c0.pdfIn PDF document text
    • http://daimontimur.org/revolut_business_account_openingfpcqx.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/kijixudeziwik-nuvapasito-salosiputosel.pdfIn PDF document text
    • http://nutupiwerumad.66ghz.com/xuves.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fe2f62a069f0.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/hsc_mark_sheet_online.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/7828858.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/belopudevuzuza/75691379422.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/cabal_mobile_apk_global.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/samuzejuf.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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5124 bytes
SHA-256: c193ac7a315ca023493ddff352d68792001a94eb7131a2de4024c74cdff9e05b
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 10100 bytes
SHA-256: 34e9b65f0deec3dd16ffef77ee2c6d9398a703577478f569fc6212739ebfd4b8

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