Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e5022a536b8550…

MALICIOUS

PDF

73.5 KB Created: 2021-03-29 05:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15add2a8e81a755ff141f086ddb60487 SHA-1: 49e2d1e9abf3d266225905da03b4ffcc19f02d5f SHA-256: f9e5022a536b855038fc1db0f0f365f4c2457753b10a582cec76e7aa1b14e28e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pattern. The embedded URL 'https://maypoin.ru/award?keyword=knee+arthritis+stretches+pdf' suggests a lure related to health information, likely to drive traffic to malicious or spam sites. While no scripts were explicitly extracted, the presence of external links and the ML classification indicate malicious intent, possibly involving JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/award?keyword=knee+arthritis+stretches+pdf
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/bepujobekelog_divus_nawowodarurev.pdf
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/9829821.pdf
    • http://pozijuza.scienceontheweb.net/methods_for_antimicrobial_susceptibility_testing_of_anaerobic_bacteria.pdf
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/d709ee71.pdf
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/8890587.pdf
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/2519221.pdf
    • http://maxobujixeweden.sportsontheweb.net/72430700177.pdf
    • http://zofunubesosena.mypressonline.com/princeton_review_mcat_psychology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilatelisoto.onlinewebshop.net/45630007729.pdf
    • https://s3.amazonaws.com/tobito/cesare_beccarias_essay_on_crimes_and_punishments_emphasized.pdf
    • https://s3.amazonaws.com/tokatefozude/febovebuwixosoka.pdf
    • https://s3.amazonaws.com/mexavofezoxi/jakaloduw.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_7dec5e6fcddb4475bda10ce878bbb366.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/fowonodipekajutexejazivev.pdf
    • https://s3.amazonaws.com/sizadagazagaj/najemanuvurilikefetowesum.pdf
    • https://s3.amazonaws.com/wujanozo/lagu_celengan_rindu_cover_febi.pdf
    • http://rupatal.epizy.com/formen_fr_cannels_de_bordeaux.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_d9801a70f99442f48208d771c9cb380b.pdf?index=true
    • https://s3.amazonaws.com/suzujewa/cloud_foundry_commands_cheat_sheet.pdf
    • http://weguxaja.rf.gd/iron_carbon_equilibrium_diagram.pdf
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_fd6da34b64f240a6b8da07f46a2fa59c.pdf?index=true
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_0118bb1f1fd44ef793c6a96e85ca5d41.pdf?index=true
    • http://xekenajale.rf.gd/simplifying_complex_rational_expressions_worksheet.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_off0000e3b2.bin
f8f155921b17c6e22092056b91eb8ec7f6df34eae194b3d772bd39cb0019e5c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 5180 bytes
font_01_sfnt_off0000f552.bin
dd91b2c238ec7c06e22e5931447770ac45e34cdbb84cb802011595a15637dffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10428 bytes

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