Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb802dd960ced91d…

MALICIOUS

PDF

89.4 KB Created: 2021-03-08 14:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 53babed1b200dcc8a08bbac76c733d1b SHA-1: e536d6226741726ab76d918ccc561d478719934f SHA-256: fb802dd960ced91d641f78ce557dee5b872fc5a9d699585be145faf0e554a3b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to 'human body systems diagrams pdf'. No scripts were extracted, but the extensive link farm points to a phishing or malware distribution attempt.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/123?utm_term=human+body+systems+diagrams+pdf PDF link annotation
    • https://cdn.sqhk.co/bofagenined/Dgceieg/velilusotufovosamokew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_60307a58bac12.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/jhcfghw/31631949306.pdfIn PDF document text
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/c06fe8e6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe3f3ee6a67e.pdfIn PDF document text
    • https://cdn.sqhk.co/kukabelek/jVNN77L/browser_video_app_for_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/gYCRngg/55105460897.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/3021944.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/gSnif4J/mega_hit_2000s_songs_collection_arijit_singh.pdfIn PDF document text
    • https://guravigipide.weebly.com/uploads/1/3/2/8/132815190/1571298.pdfIn PDF document text
    • https://bazodezivif.weebly.com/uploads/1/3/6/0/136088162/fajowuzof-regot-tuzokadubi-xuvurimimimatef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://binuwuzipu.myartsonline.com/8570926383.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/letak_ictus_cordis_normal.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_0d2dc78c388a431eb2ac5a8606796569.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_2fba292f73ad445ea4d34b0ad1b84ae2.pdf?index=trueIn PDF document text
    • http://positajugopisu.myartsonline.com/devazunivexesibibiz.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_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 5532 bytes
SHA-256: e1910b76512e3a7be70353d87193344411b059e6409e01216fe8ce6febf6ad4d
font_01_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 11448 bytes
SHA-256: 0d03fd28eddf6bcc28f873dd8a555ef23e9981c6b85558e1c08c553b9b76a4cd

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