Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cd95b64f51b911…

MALICIOUS

PDF

86.3 KB Created: 2021-01-23 16:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7bccef10b2cde92083ac27034e006964 SHA-1: 9786fa3f26515ce779ff091f74e011db075ce0fc SHA-256: 41cd95b64f51b911c321e1d1527bbb6ede2d749ac6bea9b3ebbfa5caac69200b
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a redirector for phishing or malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. Although no scripts were extracted, the presence of malicious links suggests the document is designed to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffmen.ru/aws?utm_term=ielts+answer+sheet+pdf+2017 In PDF document text
    • https://site-1212439.mozfiles.com/files/1212439/13710263849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fd0e9fdc2a5b.pdfIn PDF document text
    • https://site-1174180.mozfiles.com/files/1174180/2994269035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368249/normal_6001e47769673.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/lab_safety_rules_worksheet_answers.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/xewomawemekejag.pdfIn PDF document text
    • https://site-1180237.mozfiles.com/files/1180237/ninifofosulozela.pdfIn PDF document text
    • http://gexafudotifunud.66ghz.com/sidilokafexekusi.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/4993756.pdfIn PDF document text
    • https://pejasosujotu.weebly.com/uploads/1/3/2/6/132683127/88c11b57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wojobawezelo.rf.gd/losule.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/block_calls_on_android_kitkat.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/11458888371.pdfIn PDF document text
    • http://dekefolujif.epizy.com/lirik_lagu_sisitipsi_alkohol.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_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 5564 bytes
SHA-256: 957579402155fcbbd4d96138c43add0fa22b21961b832680c17e33bc7984de86
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 11816 bytes
SHA-256: db9e9b0e29a2200b19bfa8a538538a66b3ae33ee898a26ec7a242201d70b8ef8

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