Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cc1acf1a27c1f4…

MALICIOUS

PDF

70.4 KB Created: 2021-05-07 05:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13062ccda73f087d97f4fb3f1d36140a SHA-1: 128ca89c43e2f03c1c6571c0f41348238946a4c0 SHA-256: b6cc1acf1a27c1f420e979512d19f1f71e9021fc6d716a0c20a5067efe23fabb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://pelibifir.ru/strik?utm_term=walmart+pharmacy+number+gaffney+sc PDF link annotation
    • http://linza.media/a_series_of_unfortunate_events_castnzalj.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/25152327749.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/resavebaxofux.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/marketing_management_15th_edition_ebook_rental.pdfIn PDF document text
    • http://kieverts.xyz/sensory_words_examplesqk75u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_b69e9e5b42c043898dd9bf7e1309b7fc.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_a7bb0efcb9e04ef3835f78d78e95da38.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_476442d029914da69e393509b6726ef1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/halloween_word_search_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/xalizilanovosuwez.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/how_to_connect_brookstone_bluetooth_earbuds.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_76c8b19dcde34ee2bb3120c9d39ed54d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zasepo/falozujafifiremiget.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/21007450430.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/zexepigavug.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/40887685331.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/75667674879.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/what_are_the_warrior_cats_names.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/lukere.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 5408 bytes
SHA-256: 8bd296182d17754e174a4a79b2235522a276857a77b9e97e33ed0eebcfb84edd
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 10432 bytes
SHA-256: 0d791594b283e77e4fff50138ba7c36ef6177efeb4504bafe0ea51f34108866b
font_02_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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