Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcae3ffaaa07f70…

MALICIOUS

PDF

83.5 KB Created: 2021-04-30 02:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97bff2e9d34de4ae29241671a7317894 SHA-1: 1c29000c14c1a4962627bb4637f53bf7f9e8fdb1 SHA-256: ffcae3ffaaa07f70c37c02457b14e20e43f9eb926aaa441b4d1714d04d0d79ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. One prominent URL, 'https://seumenha.ru/strik?utm_term=casio+sgw-1000-1acr+review', suggests a potential lure related to product reviews. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=casio+sgw-1000-1acr+review
    • https://setovejuno.weebly.com/uploads/1/3/2/6/132682792/dajukorojegabi_zunaxukibijal_foxikizavoraba_pajexovimak.pdf
    • https://static.s123-cdn-static.com/uploads/4384152/normal_6004ce0e3146d.pdf
    • https://cdn.sqhk.co/vijamabaf/khbGRWg/parepifiz.pdf
    • https://cdn-cms.f-static.net/uploads/4453342/normal_60468f0274610.pdf
    • https://cdn.sqhk.co/wenegifuteg/YjdpFHd/30627534166.pdf
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/jatolozeminaxegadi.pdf
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/limulofemupus-tuwogixup-movazopab.pdf
    • https://xudemogarutigi.weebly.com/uploads/1/3/4/7/134733212/pofugakiv.pdf
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/237967.pdf
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/8183d521d.pdf
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/lelefiviwadera-kaxovepanobo-faratopufu-vemegimedubi.pdf
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6065c2d248a27.pdf
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/vobawakoxuvepuw-tokofaxi-kawozetip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/didowugorokirug/63710268695.pdf
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_1bee68b6992b406385e9e36d2b030f06.pdf?index=true
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_bc68ba3b53094d9cb03caccf284a8257.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_79b7512efc464c1ba840e3701821af9f.pdf?index=true
    • https://s3.amazonaws.com/rakabexozu/does_verizon_wireless_sell_jitterbug_phones.pdf
    • https://s3.amazonaws.com/megulu/woziluxogetumukumane.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_off0000ea1c.bin
5b579866191292e5c10b6de03712cd92344651db451fd51d2fea1efaa88cbb04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 4940 bytes
font_01_sfnt_off0000fb12.bin
152181e5c1f7dc1123a86b8941ddd10ccc89c3a916a73f45e9cd9c8c6b255e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB12 23104 bytes
font_02_sfnt_off0001307b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 4324 bytes

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