Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b330757bbc5aea5…

MALICIOUS

PDF

77.6 KB Created: 2021-05-22 22:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6ad01343c266937dcdb4c4b924e39bd7 SHA-1: 56a299d43124e8a32e850ab7cddfcefeba391139 SHA-256: 2b330757bbc5aea5125d91799c400136b23c8e29536af1be90cd8d45582a1e2a
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text related to 'video converter' and 'portable download', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/strik?utm_term=video+converter+ultimate+portable+download PDF link annotation
    • https://nugezufetewivu.weebly.com/uploads/1/3/4/5/134598593/6682774.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/tinibenana_gaposujif.pdfIn PDF document text
    • https://mupexopuwes.weebly.com/uploads/1/3/4/7/134722910/cacb3de1.pdfIn PDF document text
    • https://dumuwikodopod.weebly.com/uploads/1/3/4/4/134458554/wukirefugadab.pdfIn PDF document text
    • https://bemilinup.weebly.com/uploads/1/3/4/3/134390274/9870586.pdfIn PDF document text
    • https://fusopozosasotex.weebly.com/uploads/1/3/4/4/134477759/3cf82ac50506c.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/0e307ebaab88.pdfIn PDF document text
    • https://parudebizaju.weebly.com/uploads/1/3/4/0/134096066/wokosogurogufufafim.pdfIn PDF document text
    • https://noduxureravit.weebly.com/uploads/1/3/4/7/134743755/gawem.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/fowikorejodi/79382587298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77186eb-00c8-4e13-bf32-a214472f2004/how_to_clean_a_kirby_sentria_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/buscar_mi_iphone_desde_tablet_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fce87a7-631f-441b-9a70-89c4a7eae6cc/cool_iphone_text_tricks_like_pew_pew.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/97720068267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fbf89f-6e9a-45fa-8d20-9db3fceb64ce/html_and_css_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/how_is_a_cf_sweat_test_performed.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/how_to_operate_toto_washlet.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/60729666074.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/giveki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8aaedd1-cb80-408f-ba42-3c0981faed35/70874461949.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/7491625270.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/kazawadab.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/riwunofipisabigipari.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/zixofipoxubog.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/kukuwexelajeb.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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 5300 bytes
SHA-256: 33b28d612b47943af045ebbf81dc02682e87660d4364dcc38787b96ea8b676e1
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 10384 bytes
SHA-256: 5ff6c3091474d113d16fed9fca3ee947a1c96fcdbb25c8c1fe048557548c5228