Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9130e97f3ecfd7e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-02 22:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f861de4415dd1b43de24892adaeb9b54 SHA-1: 16e0121f1fd72367330b2b0719e6873f0f6b39ab SHA-256: e9130e97f3ecfd7e1f940f1899f60da6b23c3b0bc5f90733794272a24c73ad1c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://resalured.ru/123?utm_term=romeo+and+juliet+act+3+scene+1+modern+text
    • http://testersairf.xyz/goodnight_moon_story_book_onlinet9ogf.pdf
    • http://greyfruit.space/everglow_bon_bon_chocolatf94hl.pdf
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/tufinoxize-xojipidebi-rujawesapim.pdf
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff8476322d33.pdf
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/6394825.pdf
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/sofaso-sewakekit-tixofaxap.pdf
    • http://nitiwopororotef.mypressonline.com/tuwoba.pdf
    • http://tebogekememesij.mygamesonline.org/17525360875.pdf
    • http://lozipazom.sportsontheweb.net/48998349688.pdf
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/zakorewaz_xebut_bujogupoje.pdf
    • http://vorgazme.com/nick_carter_dancing_with_the_stars_week_1o1pr5.pdf
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5ff1efa46138e.pdf
    • http://kufigada.22web.org/xirudutozorozinasivewaki.pdf
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/domofag_seridazexowason_wusimewojuridif_wamisor.pdf
    • https://cdn-cms.f-static.net/uploads/4384164/normal_5fd6e164dc25b.pdf
    • https://kapojisu.weebly.com/uploads/1/3/2/6/132696117/kinaxal.pdf
    • http://glasshookahcatering.com/rajasthan_commercial_tax_c_form_verificationqgj57.pdf
    • http://xosubowavenu.mypressonline.com/pafexepigufiju.pdf
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/jozodediki_kiretefujibuk_fiwiwe_berazenikaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mifinuxob.epizy.com/mapa_conceptual_de_la_clasificacion_y_propiedades_de_los_numeros_reales.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_off0000f2e5.bin
0f13b4d5744bf5489ff7b13b90e5f3dd3161ff887687dfaf8111a4eb4351c8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5452 bytes
font_01_sfnt_off0001056b.bin
36558903edde833153faf8725879bf7f8ea99756cc27ad074e7bf72370fd2210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10560 bytes

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