Malicious PDF — malware analysis report

Static analysis result for SHA-256 e443d593149d57b1…

MALICIOUS

PDF

80.8 KB Created: 2021-04-21 18:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a40b7abf985765a4dc5fd9c7519d7da SHA-1: 7b8e52c982d57361cf0007daeb9b5b0dc69f4ab3 SHA-256: e443d593149d57b108de44969d1a43e5a7d46ae2435b71a0f47f9140c9cdf66b
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=apple+iphone+5+wallet+case PDF link annotation
    • https://cdn.sqhk.co/xefilelo/ZLgeJhf/fikogopora.pdfIn PDF document text
    • http://alsamcctv.com/another_eden_mod_apk_1._5._1d1pt1.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/lowosatojoxugxk6.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/igjiGgd/zig_zag_rolling_papers_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/gjqQa30/highway_traffic_car_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/uliijbj/kitolevutujo.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/bjdifHD/xuxivikifatulawoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_7b4688c9aeaf4dd596ac0b4bf9d84b11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c924756b-5a19-4fc5-a880-0de59a400819/lubevobizujim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b99bcb2-f426-4b24-b5b9-bcd3aa0d226f/85615134162.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_8ace95636b1a46cc851339fe7dae2533.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_dd0d3525b9414cd4a77a13b75e94ca09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/516f6ccb-fc10-469f-9f19-8b82116f8086/nonisuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f3eae6-57a9-446d-8e90-f0d99ebf5dad/37151580912.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_f810ccaff1f44e2d8d1ccd613852768a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be22ed9-9a7e-4f41-ac40-9aec4a561f44/frequency_distribution_worksheet_probability_and_statistics_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda112ae-09c1-4693-be75-3a6ca9865ced/geometria_analtica_steinbruch_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5efa5c6-9bb6-4f75-a720-f337ca35b637/1817977194.pdfIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_0e6611a823f14d8cb19740063cfa9431.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_b95f8e151c25454cab6b9a03c8a774d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9adbf7-4f9e-4f21-bf40-60477fd355b8/what_does_mi_alma_reclama_mean_in_english.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_ee3559265f42459db43fb81aa73c60e7.pdf?index=trueIn 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_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 5132 bytes
SHA-256: cbcce4d0352b36a56202d4ad2ce5c69cb7b72a0b7603c1d8b09787ed89d00ca4
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 11124 bytes
SHA-256: ea9bc2de5d82cfa8ef6df74de92f3899df31557813ffc286c4492473d68e7ca9