Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7f6dded631bd2b…

MALICIOUS

PDF

100.2 KB Created: 2021-02-20 02:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1ce81e60b1c8993018438e077e1eedc5 SHA-1: d1dce7c02f73b474c07ba1a58ee1a4f842f8a8f4 SHA-256: aa7f6dded631bd2b7c4a34a31423e49f9c51c43d2258b4c32aff3e67d6c11dd8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on free domains, indicative of a link farm or SEO spam. One of the primary external URIs, 'https://seumenha.ru/123?utm_term=a+pearl+of+great+price+idiom+meaning', suggests a lure to attract users searching for specific content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • 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/123?utm_term=a+pearl+of+great+price+idiom+meaning PDF link annotation
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/3371916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_60230491cd0a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5fe006472926b.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/jonejida.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/4362715.pdfIn PDF document text
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/7971254.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/c182a1291.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/uss_exam_2018_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://lawedeg.rf.gd/fizuwevokeg.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/mamiya_rb67_buy_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/good_guides_for_class_11_cbse.pdfIn PDF document text
    • http://xugiben.epizy.com/wopojedotugetabafa.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/69863135382.pdfIn PDF document text
    • http://gejaran.epizy.com/gutev.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/gigano.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/vizowizerizidolimufowal.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/38925195365.pdfIn PDF document text
    • http://gorefadusajog.rf.gd/baffin_footwear_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/hygiene_kit_distribution_report.pdfIn PDF document text
    • http://nanafof.rf.gd/creating_mailing_labels_from_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/animal_exposure_report_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/13874424485.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 3172 bytes
SHA-256: 26488483408b280933148792d5cfd1e1f26da82f09fd8f86d701706db380e699
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5284 bytes
SHA-256: fcf5d626c81c5ec562ef0d38aec919cac98a3d31597e86af075506f92bbdc24c
font_02_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 5996 bytes
SHA-256: 9af9df82d75a02e2d303ecaf317cba081f698058671215c26fc54378da9d1077
font_06_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 13100 bytes
SHA-256: 47a8eab970c76788f4ae87b5ff64a2456b896193567d7b082745c26c751e05ef
font_07_sfnt_off00015bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDA 17088 bytes
SHA-256: bac7b8000ce6e8d992f6e85a2232bf2dab5593b8d2ba33ebb9148c1f0f8c9d0c
font_08_sfnt_off000174b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B1 2832 bytes
SHA-256: a12908a88df35a7e9eb57470e9a94a806bb52df392ce88a62d07cba2b79b9044

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