Malicious PDF — malware analysis report

Static analysis result for SHA-256 187a49142155e9ba…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 06:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd0309db68ccff9f4fab1deacda73d87 SHA-1: c25e3140cd8a3483a2ab0d147d37be0946c148fb SHA-256: 187a49142155e9badde66aac01b4aaf757bf801741992bb61ce007146e041082
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary URL observed is https://mezovuduw.ru/award?keyword=argumenta%25C3%25A7%25C3%25A3o+l%25C3%25B3gica+pdf, which is likely part of the lure. No scripts were extracted, but the PDF structure itself is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=argumenta%25C3%25A7%25C3%25A3o+l%25C3%25B3gica+pdf PDF link annotation
    • http://zodimasar.mypressonline.com/sezabuvejivemunajukowi.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/bogipezakeripo.pdfIn PDF document text
    • https://negopipeminote.weebly.com/uploads/1/3/4/8/134885603/2850122.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/fawepubufidotimuxejo.pdfIn PDF document text
    • https://rajajedoweji.weebly.com/uploads/1/3/4/3/134310645/siwuzixelekiw_doxif_fikelademezan.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/ccsa_checkpoint_study_guide.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/noranojituvekazali.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_yoga_breathing_exercises.pdfIn PDF document text
    • http://tosugev.iblogger.org/cultural_adjustment_theory.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/79583276688.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/7c736ad1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nafibanefexex/98600468786.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_e274b58467614db2b66119f3746f3797.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_60b8e36813534deebdb9b4c2f73e5490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/bizivivefumitowiri.pdfIn PDF document text
    • http://tetizawoto.rf.gd/online_masters_degree_coaching_psychology.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_cb3748884c2341bf973c22b2eb844256.pdf?index=trueIn PDF document text
    • http://todifisafi.atwebpages.com/fapebejalogopozut.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_9bdc19639637412aad368196fd82fdd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/lodagonuwosuvozonotu.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/estudio_sobre_el_bautismo_en_agua.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_a3a4d52353584e328e62774f1cc50132.pdf?index=trueIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/19502382256.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 5804 bytes
SHA-256: 1c894b9129891ef78c5d23cf30f5b580fb1b9b4afcbab2205a6aab2872b7030d
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 13020 bytes
SHA-256: 03bded766d6674d374f292d9f52c88fbcf6f84e8e75ed0b162f61238428ee25e
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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