Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6431112bdcb7e3f…

MALICIOUS

PDF

92.0 KB Created: 2021-02-21 16:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 53a409df940af7ad05e81e7dceffe810 SHA-1: 8f0625e172b7db6f1b31d5c2f4d44c5a416bf32e SHA-256: a6431112bdcb7e3f5ae3ec0bf67073dc65a3ffbb0afb714e18b7a4952c0e952a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'seumenha.ru/strik'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS', suggests a phishing or scam attempt to redirect users to a malicious site. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of external links indicates an attempt to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+fast+is+a+2010+camaro+v6 PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/rovewefesivatope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369306/normal_5ffc0ecfb11f4.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/pebavabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495843/normal_5ff264a678f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fe152f53f6d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6015c15c2da86.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/2300685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_602d8dd46ef6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494432/normal_602c526218719.pdfIn PDF document text
    • http://neviresutuv.iblogger.org/56870870337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_6005643c2c2d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_5fdbc4623a951.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/wewiro/54143080067.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/dark_avengers_3_game.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/how_to_use_a_ge_self-cleaning_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/67185483224.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/user_guide_template_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/azure_storage_blob_python.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/26698360971.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/cbse_guide_class_11_maths_sample_papers.pdfIn PDF document text
    • http://zexeborora.rf.gd/basel_2_risk_parameters.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/akuntansi_pajak_atas_piutang.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 6676 bytes
SHA-256: ee6f16e0c8fbbdb31aff1aaf3ce7e76a5fe775949f4c4bd5e090cddb5182f6aa
font_01_sfnt_off0001070c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070C 5588 bytes
SHA-256: 786d2cec8a6e398ba2de31903a7444186bcb91318441f10b5b16c6a3d998c8e6
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 2880 bytes
SHA-256: b294f855b058117e8e2cf946fcba6177f7aaf397d4fa3c4e4961c65e5ea9674f
font_03_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 11160 bytes
SHA-256: 2f616f638be93999f05fefce4fbcccf1a6ee2ca1a43f7f140db66c8abfd75194
font_04_sfnt_off00014c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C51 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb