Malicious PDF — malware analysis report

Static analysis result for SHA-256 f276862c37d0028c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 06:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87186c052c780f2d7b10776f39c1e55e SHA-1: b7bc819f325aaa1685d0559601f0b74e60d340c2 SHA-256: f276862c37d0028cedf8627e353249257d0f58a569ad85598d858ddf7be85da5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are suspicious, suggesting a link farm or phishing attempt. The document body, though heavily corrupted, appears to be a lure related to 'Romeo and Juliet study guide act 3', likely to trick users into visiting the linked sites. No scripts were extracted, but the presence of numerous external links indicates a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=romeo+and+juliet+study+guide+act+3
    • http://reduslim-italy.site/930643952142zt39.pdf
    • http://static-get.top/hero_xpulse_200t_top_speediy2bu.pdf
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/2122321.pdf
    • http://techanomic.com/kunaxagasij7ttu.pdf
    • http://servicesforsupport.com/giratodamufu7brp6.pdf
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/7844990.pdf
    • http://mixed-rootwork.com/dengue_fever_who_guidelines_2015vmx4x.pdf
    • https://xixusumer.weebly.com/uploads/1/3/0/8/130814933/wujujaxutivujo.pdf
    • https://sufupixugopibo.weebly.com/uploads/1/3/5/3/135316623/fb32acf8f76.pdf
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/pulidinupapo_ramoxipolu.pdf
    • http://buytoday.cc/how_much_does_it_cost_to_have_a_car_alarm_installedm4djs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_05288188b54c48168400ca1b80790b4e.pdf?index=true
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_379252c586ef4e7e9b6a3679b652559c.pdf?index=true
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_ede8ab8438014fd49546c2a15f483e05.pdf?index=true
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_6d51ebcebe134aab97b88efc4d104e7e.pdf?index=true
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_e20286a4e74d47f1a91315fb9af51dfa.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_4285b662508b4306a051b16d24b0411a.pdf?index=true
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_67a0f868537e48afb805182c74669a31.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0400b4f-6c58-4e34-a452-d6a65702b9b3/6230292343.pdf
    • https://uploads.strikinglycdn.com/files/471029f9-1c09-416a-a82c-9d3a9aac7fba/zifinoban.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_off0000ef67.bin
ed71e69d8bef19ae6791d9722bc9b34be3d1e98b69ab46aafb9a7efec50e29ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 5512 bytes
font_01_sfnt_off0001022f.bin
b3e1139b4fef41e3eb398ee3246030921463ff42cb5a502ebe39e0f36ac8bc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 10784 bytes

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