Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2e1f9952bcbf89…

MALICIOUS

PDF

115.6 KB Created: 2021-03-23 10:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b20653cd54f4cdea1df81814439fea7 SHA-1: d09bc9f94512ceaff98385480574d8d6fc20202c SHA-256: 0d2e1f9952bcbf893cc288e0bf07ea8421c85bd4904a48e299b5153d176897e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or SEO spam tactic, with one prominent URL being 'https://ponafet.ru/award?keyword=child+care+tips+in+tamil+pdf'. The document body is heavily obfuscated, but the presence of external links and the ClamAV detection point towards a phishing or malicious redirection attempt.

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://ponafet.ru/award?keyword=child+care+tips+in+tamil+pdf
    • https://cdn-cms.f-static.net/uploads/4393637/normal_602b611390f61.pdf
    • http://vubureteka.22web.org/what_is_knowledge_integration_framework.pdf
    • https://cdn-cms.f-static.net/uploads/4500450/normal_601eeb9b825d0.pdf
    • https://cdn-cms.f-static.net/uploads/4460688/normal_6020d392d7453.pdf
    • https://cdn-cms.f-static.net/uploads/4471686/normal_6038cea4acdd8.pdf
    • https://cdn-cms.f-static.net/uploads/4403282/normal_60303c52dab76.pdf
    • https://cdn-cms.f-static.net/uploads/4412761/normal_6016c2304cda2.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinezedu/13873450792.pdf
    • http://gazadimo.rf.gd/revised_bloom_s_taxonomy_action_verbs.pdf
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_5ddd37c6eb7f4306a8ca849398537acd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a51882f4-04fe-40a1-8f8e-17a8b08f8985/42393839202.pdf
    • https://s3.amazonaws.com/dibedamoka/cosmic_gate_20_years_album.pdf
    • http://gedonisezif.epizy.com/setup_microsoft_authenticator_android.pdf
    • https://s3.amazonaws.com/gagotaniwipure/28424033805.pdf
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_9c5414f190a74b01a660632978f74bfe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/07161115-5b54-4f04-a9bd-091817148faa/prayers_that_bring_healing.pdf
    • https://s3.amazonaws.com/xukonakefules/53196816684.pdf
    • https://uploads.strikinglycdn.com/files/02aac0fc-7dac-4400-b3e3-71896427def5/wufanu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00016470.bin
3998d2726286aa546929b2b03c55a4e0f6270df65e94bac5010eeee4aa8502d9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16470 27876 bytes
font_00_sfnt_off0001529f.bin
51b6ae2b1308236b0b7f60bd8d663d481e961d5fdf1b4fe032822a5bfe2ce9ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529F 5300 bytes
font_02_sfnt_off00019afe.bin
7fd9d2554cfe35f7a904110263a640c4c54d910cef35b2c6a6cd362513b569b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AFE 10552 bytes

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