Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1457745b18bc0f…

MALICIOUS

PDF

79.7 KB Created: 2021-05-23 08:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5f28b956f46e1d477bd7d7fbe191392f SHA-1: 5f7d7e668185749d916b61a2245367af814297d7 SHA-256: 9d1457745b18bc0f5560171ef12df120bfd9b08a648b8fc647ff9c05141a7fcb
164 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 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-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.
  • 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://midufefew.ru/strik?utm_term=alexander+2004+movie+dual+audio+download PDF link annotation
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/mubadi.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/rorew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462732/normal_6028610d9ea39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_603419f82be2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_602d9f1bb2a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491433/normal_60563f989b84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_605b5e7c18af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6041d6c009314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_603e86fbe15b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374536/normal_5fe1884f3de6f.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://uploads.strikinglycdn.com/files/fc96ab92-8b70-4a69-9aac-b3c612d9adc0/35753115173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb03d51-a939-47e1-bf1d-058bdea7e3b9/nexalilozojepe.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/engagement_invitation_template_for_whatsapp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0611e12b-184e-496e-85a9-b2b4b121fd6c/hp_psc_1315_inktpatroon_controleren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/584239ef-9545-4b5c-ae2b-a65360c30802/75923882935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61d0263-acd5-440b-925b-7a058874f311/75235376991.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/formal_pant_design_for_ladies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e30191-80aa-46ea-94f2-573f25d93402/physics_for_scientists_and_engineers_3rd_edition_randall_knight_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ffd01f5-cd4c-471f-8edf-12d898062e3f/96474600198.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/89400398544.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_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 5164 bytes
SHA-256: 7759f0b0f99ed6a5b388c345a0964ad14ec07a1ff18f936481b91d0f062754ae
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 10528 bytes
SHA-256: c0977cb84b7685f74f66380f20e535bc7ff2c05e990142eada194e7b03d86025
font_02_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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