Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b858f30d8da8da…

MALICIOUS

PDF

94.8 KB Created: 2021-03-09 17:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89034bd98540d3af5e9af6439746c001 SHA-1: 445b3552c707d65f8f9512cd6e1bc6c4889d7602 SHA-256: 54b858f30d8da8da1215d0bbee1cd9e1d520082767fd51e5f15d97b29e5cf0c5
156 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 phishing or trojan threat. It contains numerous external links, with a primary URL pointing to 'ponafet.ru', suggesting a link farm or SEO manipulation tactic. The document's content, though heavily obfuscated, appears to be a lure related to 'formula quimica significado'. No scripts were extracted, but the presence of multiple external links and the detection results strongly suggest malicious intent, likely related to directing users to harmful sites.

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-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://ponafet.ru/wix?keyword=formula+quimica+significado
    • http://subonus.ru/bipolar_treatment_guidelines_2016m7gzw.pdf
    • http://rmk4sale.xyz/karidabujuniwedi0peot.pdf
    • http://instgrmmverifiedbadge.com/modern_warfare_servers_lagging_august_2020kneo5.pdf
    • http://mishgen.com/91303521807sndrh.pdf
    • http://tokio-2020.fun/sat_practice_test_2_answers_khan_academyi31d6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_282cc9ba3d2043e886b8e8a73885f92a.pdf?index=true
    • http://disejeninajexak.rf.gd/john_deere_l110_deck_parts.pdf
    • http://jipinasin.epizy.com/fda_ind_safety_reporting_regulations.pdf
    • http://xevorerokune.epizy.com/parentheses_punctuation_worksheets.pdf
    • http://pejefovad.epizy.com/jemodewejubumabagide.pdf
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_438df6fd3bfc470db74d9ba54d7f00d4.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_3f174cd40bfe4322ba3e4764d9345836.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eea11c25-ca20-4b17-a339-85e6a978f25e/wufuvezudirinurike.pdf
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_e61dd363c67347e29ee06cd7e4ad1fe9.pdf?index=true
    • http://zejowupifodoj.rf.gd/jefale.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_470a14d87586485ea0e56087ebf1514c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b27ac12e-4586-4b85-83a8-7e3af8587c9d/84440277409.pdf
    • https://f3aab0fb-6e62-4040-9159-fff43e2f27dd.filesusr.com/ugd/9b2d9b_8f4eca681a0a42f9bb3e95e2a117229e.pdf?index=true
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_9b5cc8f9464f480bb961b59bcd44e5b8.pdf?index=true
    • 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_off0001355d.bin
47786647f3cdd479479b24e2c8a63b93d1af4a52c78603fa062a2506fda047b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 5424 bytes
font_01_sfnt_off000147b0.bin
da68c9af943a4ba09e142d574f3fb5dbef98052546d0550fb0887258128bc5cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147B0 11356 bytes

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