Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a22e66458b587…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 04:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 829a6e69eca8411745757406b2e8a66b SHA-1: 28ad59536cb0bfe200df7675e4985354216cb22a SHA-256: 3f4a22e66458b587ad811fd62653300b469ea29bbc2ae57ef794c2b436ece310
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDFs hosted on file-sharing services, suggesting a link farm or phishing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/aws?utm_term=craftsman+electric+start+string+trimmer
    • https://sabumamopadav.weebly.com/uploads/1/3/5/9/135957329/gezokazuj.pdf
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/pitafebakedatop.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/6152275.pdf
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/7277216.pdf
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/bezitikuzi-jifogelanori-filojibudosew.pdf
    • https://wejerimaz.weebly.com/uploads/1/3/4/6/134648800/24040d5f4e1dd9a.pdf
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/purubuzoz_gevuvujazesod_xenakuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3a0985e0-c748-4a40-ac83-8f8cfb78015d/jezura.pdf
    • https://uploads.strikinglycdn.com/files/d8c76cf9-cecb-412a-8e0c-dc28a5897d62/new_testament_books_written_as_letters.pdf
    • https://uploads.strikinglycdn.com/files/307eabd8-59a7-46d3-b584-c046e17b540b/gavun.pdf
    • https://s3.amazonaws.com/muwomapotumugi/86836335895.pdf
    • https://s3.amazonaws.com/gomakobez/laritavatinopep.pdf
    • https://uploads.strikinglycdn.com/files/175cd645-f38b-4408-be26-40556267fde5/54209755050.pdf
    • https://uploads.strikinglycdn.com/files/12622f53-1c50-4d2a-bcb7-e6ffc675d10a/who_plays_big_rhonda_that_70s_show.pdf
    • https://s3.amazonaws.com/jiwisi/would_fill_a_void_meaning.pdf
    • https://uploads.strikinglycdn.com/files/9340019c-f0e1-4f80-b774-b6eea3fe2bb6/66555760847.pdf
    • https://uploads.strikinglycdn.com/files/e2ee80fc-4774-44a2-a7aa-982db08659cb/liwiwafurerukufuvewugexus.pdf
    • https://s3.amazonaws.com/zemunomipazikez/62942450567.pdf
    • https://uploads.strikinglycdn.com/files/853e1d5f-f5c2-42f6-8b1e-18fd10b21a9e/1479860696.pdf
    • https://s3.amazonaws.com/siwixomudit/airline_stewardess_uniform_history.pdf
    • https://uploads.strikinglycdn.com/files/9a572647-e5f9-4da1-9134-38c72b0d1995/frigidaire_fridge_parts_near_me.pdf
    • https://uploads.strikinglycdn.com/files/a416a593-a65c-4cd2-86de-1a53a3c6fc2f/meade_lx200_gps_uhtc_10.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33e.bin
0a652678016e2fd47117412b043a82a37d8bee731049dc07605e0390e2be6402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 4900 bytes
font_01_sfnt_off0000f3c7.bin
89c16c8d9281470883e1ba039c436e1f66768b8f24e75fcb061eaf543a5ee92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10684 bytes
font_02_sfnt_off00011869.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 4324 bytes

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