Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bee416b5d6a7c1f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-01 06:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 784e3165369b16e274882320139d8925 SHA-1: 6ec9d422c9ca94d51f7c7f8a605cce158c978b2d SHA-256: 3bee416b5d6a7c1fb320d8f150345d1563436088e0d78f9318c42c080fd4598c
184 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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely related to the 'how is sociocultural theory used today' query embedded in one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=how+is+sociocultural+theory+used+today In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fcc7080881b7.pdfIn PDF document text
    • http://dimax.website/86841903780sgi8t.pdfIn PDF document text
    • http://goodshopsales.xyz/photoshop_touch_apk_latest_version8eegn.pdfIn PDF document text
    • http://letxxnx.org/240216973627gbe6.pdfIn PDF document text
    • http://antonioit.fun/how_to_delete_google_search_history_from_android_phone_permanently0pxf4.pdfIn PDF document text
    • http://indir-kazan.com/77443313556amldb.pdfIn PDF document text
    • http://mirror-x.org/1588613616739d4i.pdfIn PDF document text
    • http://dressnbuy.com/how_to_turn_off_honda_accord_maintenance_lightcbydw.pdfIn PDF document text
    • http://carishr.com/sharepoint_for_dummies_2016kyiu0.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/tavazufubumixo.pdfIn PDF document text
    • http://lalat.space/dakoxevofodevesizusuwixbdm9.pdfIn PDF document text
    • https://lifuregetarip.weebly.com/uploads/1/3/4/3/134384561/podamegikalufuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fd17da015e1e.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/futamo/media_essentials_a_brief_introduction_2nd_edition.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010c1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C1B 18180 bytes
SHA-256: 1b08b5729cb8c78a63909faa09afaa90797a1095762ab23d02a548e424cc9751
font_00_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 5180 bytes
SHA-256: 9fda937fceb5bd6db6a9b98676204e4f2e8110a6c1b39f2c3d5761a93f0e1623
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 9976 bytes
SHA-256: dad2991061784a469e1fc8fee8b681aa4d1062e7ddad3c6c5f44e6b6c9a29d28

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