Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a1aaa31a1e5f4e…

MALICIOUS

PDF

75.9 KB Created: 2021-06-11 08:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74204e986b5a1e277b5e1cf119c18ef9 SHA-1: 6f069716ce9d9a70360adcc140ba3bcbbafc03a3 SHA-256: a6a1aaa31a1e5f4e1c9abde387ba3c1ced46e23c4891742746c157504b07f617
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=angular+2+template+driven+form+validation
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/748167.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_60bc63b8b69db.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/3490734.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_604026e5e55e4.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601ab3d8e0fb8.pdf
    • https://xenifopiri.weebly.com/uploads/1/3/4/5/134507673/dumisaxasopemux-lewufodamivemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00b8a63c-1212-4fdf-a570-fe886aad3ec4/sansui_tv_remote_programming_codes.pdf
    • https://uploads.strikinglycdn.com/files/d95719a0-6b19-4317-8707-1e68f6b69993/56529687100.pdf
    • https://uploads.strikinglycdn.com/files/74968841-7371-4ad5-b26e-1d4bd7786437/nolabosomefuduja.pdf
    • https://uploads.strikinglycdn.com/files/be9377e5-7753-4a38-a6d3-c4dcd4760b1a/werenewusikeravaro.pdf
    • https://uploads.strikinglycdn.com/files/f7602b39-ac95-4408-aa13-1fc7283b8ba5/303030700.pdf
    • https://uploads.strikinglycdn.com/files/2c8f4b98-a679-4427-b1e2-a74e69905a91/lexus_300_is_f_sport.pdf
    • https://uploads.strikinglycdn.com/files/ca51fa19-36c6-41ad-b67d-4d1280d09d29/britax_car_seat_forward_facing_recline.pdf
    • https://uploads.strikinglycdn.com/files/fb8e05c0-6e40-4675-9a66-c3c7c04637fb/que_significa_tener_anticuerpos_de_coronavirus.pdf
    • https://uploads.strikinglycdn.com/files/29355f18-c6fb-4f47-bd8c-8e8fa11c1cf0/wenujexogabowotenus.pdf
    • https://uploads.strikinglycdn.com/files/7f490fc7-45eb-41fa-85b8-cae0f47a8809/21323045649.pdf
    • https://uploads.strikinglycdn.com/files/62d771d2-8908-48cd-b165-77ca485c8a52/68365951768.pdf
    • https://uploads.strikinglycdn.com/files/eaaf2c20-25de-4720-9407-49399a17e74a/figure_drawing_for_dummies.pdf
    • https://uploads.strikinglycdn.com/files/4bbc8266-a5ee-4d2b-b2ca-ea867ba83590/fajawumurap.pdf
    • https://uploads.strikinglycdn.com/files/6ae5fb68-9f09-4c6a-820e-ccfb893a9339/65522952276.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d6.bin
218ab856d0e1d7c2cb395282383ede280d49ae9280c6096f4681ac3ed4275327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 5364 bytes
font_01_sfnt_off0000fb0c.bin
bd2edaa6b277909b8004835057ea1018d090654c33ab4af0d3f680355b12debc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 11444 bytes

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