Malicious PDF — malware analysis report

Static analysis result for SHA-256 18785f6f167c0e76…

MALICIOUS

PDF

87.2 KB Created: 2021-03-27 16:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 68b5484b24c54cd5814049df791545ce SHA-1: e8b2fadb1c57d29d8c5ef3f5052ce64bb54fa33b SHA-256: 18785f6f167c0e76d3d139ee1ef2f9880aa9763713fdaf0b6a8c0cc9bb65de5b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one at 'soxebez.ru', which is likely part of a phishing or SEO scam. The document body, though heavily obfuscated, suggests a lure related to educational content, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://soxebez.ru/wix?keyword=concentration+of+solution+problems+with+answers+class+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444100/normal_60433df0d665d.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/72442597671.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe26785e1a1d.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/pathophysiology_of_epilepsy.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/33029044457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_601fec47bd05b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_6d730463eb684a8ea7894d91d2ef9c99.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_1ae10c5130ed43ae95992ae4b68a98a7.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_33e99d4935ee483c9eb18de314e32de7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c47ce0b-646e-41d1-933f-576929cdf815/lovigivefifuzixinavafani.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_6541a24224be43d8b6786c7eb6c08af1.pdf?index=trueIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_ce64e02ee93c48cfa5a138ac0b9a1778.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_16961d2238354f43894c5e002b4fd781.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/747793fe-69e9-413f-99e5-cb7c52bea8e5/the_quran_is_written_in_what_language.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_f1cf7b398b9247999fc5292ca07e2e15.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_9b560909114d4820b2d9844e67b8555e.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_8ed7edd0d5ed4e29bd03ee93f213db74.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_7bca4ae88cc74db4aabf339f72eb90ab.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_2ab16ef3759d43d79360f03880756d38.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_02bc7e00182f4f3f999115174d0c41f8.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 5548 bytes
SHA-256: 15f892136f61e5cc1193eda16ab5ef21d2069aa19bbf9345e612a996ae6a748d
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 12480 bytes
SHA-256: 5bd3a2a943d2a93e8c9d91b9519681c127bacd0cf6cfceae5fbcb0a9b8ba3fbc
font_02_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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