Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd07520ff7c2d42…

MALICIOUS

PDF

86.6 KB Created: 2020-11-11 23:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf73fb919add8f215bacae3402d5dc7f SHA-1: e506d3d9fb2d42d93ac087104d7f39edf4bb7dd2 SHA-256: afd07520ff7c2d42935edfe5d61083b5285256fed724ecdc9ce939519314aead
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document containing a large number of embedded links, many of which point to redirector infrastructure known to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Pokemon go community day august 2019', suggesting a lure to attract user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=pokemon+go+community+day+august+2019 In PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/4ce065df.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/nikepebadaruputeriw.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/8768087.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/lalimuxerolipube.pdfIn PDF document text
    • https://vagapirub.weebly.com/uploads/1/3/4/6/134648019/263481.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/sowewazulejewi/18201794065.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/sureluwopaxafirerivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e03cb2-4d15-4beb-8a2d-1eedc2de8c0f/mepokajizogerofepijogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/the_long_hot_summer_1985_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/city_of_vermilion_building_department.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd2c638-234d-4517-a1e6-8a6c757b17b5/53787294480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90ccf0e-c2cc-4012-a5d8-805ed26e13d2/aa_meeting_list_ocean_city_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82d2b23-d004-46ac-8d4e-9f12a559321b/zexutubasorotavinug.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/disgaea_4_character_world.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/english_alphabet_chart_with_pictures.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 5780 bytes
SHA-256: fc31c80124b29c4b9c750b56f182cc7eca5bc509e7c455b3aad467442dd69cbe
font_01_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 10968 bytes
SHA-256: 6669392c51ea94aa38b747b71070522f7306496bbd48568db848d673bac3ab8a

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