Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ebdc396dac3063…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 02:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e30ad9df2e766b68c00ce63837420ef SHA-1: d7b6605fb7cce1f1c00feccd9b95a0b147aad4f9 SHA-256: a3ebdc396dac306374e1ff1860b2d26e36350af0dffc9ce77defcacde630c8b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and ClamAV detection as Pdf.Phishing.Trojan. The presence of numerous external links, including one to 'lozipotod.ru', suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/123?utm_term=daily+expense+excel+sheet+for+small+business
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/e497eb.pdf
    • http://trokot-shtorki.online/263132185023a2vl.pdf
    • http://uscreditinquiry.info/kuwizemugtmy0p.pdf
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/vijurukilorate.pdf
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/5587874.pdf
    • http://arenda-comp.space/dusewelepejalasemedizasoh8xn1.pdf
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/2475569.pdf
    • https://jifefovemerozix.weebly.com/uploads/1/3/4/4/134444698/kanijelelava.pdf
    • http://antinomi.design/zasufuzukaviratimewadiwrjye.pdf
    • http://naturagrush.space/dks_1812_ixern2.pdf
    • https://gazevasodixobex.weebly.com/uploads/1/3/4/4/134437076/jojes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kisimujuk/ruby_number_format_2_decimal_places.pdf
    • https://s3.amazonaws.com/putelekireza/51016789938.pdf
    • https://s3.amazonaws.com/sudevejerifu/50540791147.pdf
    • https://s3.amazonaws.com/ragejufa/android_8._0_frp_bypass_apk.pdf
    • https://s3.amazonaws.com/tolivajupeku/47755042521.pdf
    • https://s3.amazonaws.com/xupimaral/jasip.pdf
    • https://s3.amazonaws.com/jedadokuti/diploma_cet_question_papers_2019.pdf
    • https://s3.amazonaws.com/dufekifaral/happy_birthday_gift_image.pdf
    • https://s3.amazonaws.com/fukezavazuj/bupanerexelobalez.pdf
    • https://s3.amazonaws.com/busutafitufe/62824337229.pdf
    • https://s3.amazonaws.com/befarekogol/non_verbal_reasoning_test_questions_and_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e7.bin
196a67c89677e54b478fed6c22d8c752ced17882e70597827540862fb9178b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 5564 bytes
font_01_sfnt_off0000f4bd.bin
8171b233c9cfb79f05402ac997e0ea7c93a24df53a511a739ed1cf5ec5b81c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 10772 bytes

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