Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3d27a8ca25af0c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-06 09:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1b36d2f38f1cbd9674d810b7ab5a88d6 SHA-1: 4402eb95d51181a74e3ffa929edece4a6a580e9f SHA-256: ac3d27a8ca25af0c30e0ae5902984856c206fe464467f99256fbdae4925e56cb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic pointing to a tactic of creating numerous links on disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content-serving lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=a+love+to+last+may+17+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477181/normal_5ff141324e7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_6042ed10d94d0.pdfIn PDF document text
    • http://memisada.mygamesonline.org/watchman_nee_quotes_on_the_holy_spirit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5fd79f900d229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_600e6ff93e9d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_604208e59e2c6.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/how_to_start_a_introduction_paragraph_for_an_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_6042eca576246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_602091d0c4999.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460461/normal_60052e099f9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_60319420459ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452588/normal_5ffba4a1c46c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_6005dd13e02df.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/satudifin/49821773953.pdfIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_42903ab9fd1c43fcb8a929dfc3385503.pdf?index=trueIn PDF document text
    • http://xogijowag.onlinewebshop.net/casio_fx-300ms_plus_scientific_calculator.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/where_to_find_serial_number_on_ezgo_rxv_golf_cart.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_0fc05f4080f746549efe910d8f6a3c2f.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_76508a449c9a4889b8cee47883ef8a3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bojafazes/understanding_developmentally_appropriate_practices_participant_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/mukozigelifa.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/blender_2._8_course.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_fc4764072ea14a11879c80a352c72bd3.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_d5d67246ed3940cba9dacd739c166fa8.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_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 5448 bytes
SHA-256: 925d610b8f8e4f982a4667e2b3298a6990a75ad64cd98a65d0f3f1d3b158685d
font_01_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 10728 bytes
SHA-256: b10fb9ce8fcf459cff10c871716af5f12a6fcfd0de133c9214755764b3d8df39

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