Malicious PDF — malware analysis report

Static analysis result for SHA-256 c286034c5246a05d…

MALICIOUS

PDF

68.6 KB Created: 2021-01-13 02:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3aeef296afc48273f54b098b2d6f849e SHA-1: 76d1b18e93ce1865c6c19473a49bbb1f982193fb SHA-256: c286034c5246a05d52247260c90762bc16080454adba667e0b3bb38d4482bcc5
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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/aws?utm_term=reading+skills+and+strategies+worksheet+animal+farm In PDF document text
    • https://cdn.sqhk.co/babonisu/iciehhl/wedding_cakes_cheap_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5ff2d71a527b4.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/fCcmjd6/water_slide_bounce_house_rentals_in_bakersfield_ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fb32e3f3318c.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/7fa06aa325.pdfIn PDF document text
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/jenidet_rebamet.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/g08ghgj/matikisovitif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379719/normal_5f93eb337aef5.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/gasodamuza/ctet_question_paper_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/vce_exam_simulator_2._6._1_free.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/examiner_report_acca_p2.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/royal_doulton_collectibles_price_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/singapore_airport_map.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/bombay_dyeing_bedsheet_single_bed.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_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 5484 bytes
SHA-256: 2695326e34c5faa3c7f5e61ee117d6584d24d9522a83a1242c031eb72fc41af3
font_01_sfnt_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 10920 bytes
SHA-256: 81659d33f12acdb4e5235784a35c8f5f3685d9257383fe5f9f4d475c84d1f0ff