Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ebdab1acc4b43…

MALICIOUS

PDF

73.4 KB Created: 2021-01-31 14:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08841b7a20f8917534e53b310bee477b SHA-1: 9003390234536c9de9314f52231cbe8c6f8320db SHA-256: d23ebdab1acc4b43023b6ef904e849f1a258cb6f9b2aa5402fe0d752e577aa23
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/wb?keyword=emergency%20contacts%20have%20been%20notified PDF link annotation
    • https://cdn.sqhk.co/vulovosovem/ijhGKFj/36109115612.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fe1ff7bcc333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fd6531520595.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hage2gi/first_time_pregnancy_advice_sinhala.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/9tieaYa/lajoneditoxew.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/236bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5fff48f2a0a65.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/iWhbib1/high_res_tie_dye_background_free.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/djhk5ie/90s_music_radio_2000.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/49e1b.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/dexodekelaseki/93112631072.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/crosswords_with_friends_answers_10_21_18.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/tamomogalibinevoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/28343862015.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/citizen_card_system_project_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/67459812113.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_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 5664 bytes
SHA-256: 8d3a56f38c0ecfb74885272e00842b0226550ff9e2cabc9c5a78c1d22cb2d521
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 10044 bytes
SHA-256: 0a58d95fa77de6846b69fde43f85abd6edd9ee54c5e6af9704f2c8ae77dba42d

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