Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e1d3f80b3c7037…

MALICIOUS

PDF

86.2 KB Created: 2021-04-24 00:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9cfce5863c87da88c34cce1a8f20cfd SHA-1: 266472b748021ea2f77c47c6c692be791609f845 SHA-256: c8e1d3f80b3c7037ab19cc2b3007d90eed3ad15e138db68e61d16d56bf00d4c1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or unwanted content, possibly for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=electrical+machines+interview+questions+and+answers+pdf+free+download PDF link annotation
    • http://vipimuxatomefi.medianewsonline.com/85734994072.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/8897242.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/helter_skelter_guitar_tab.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/02d378e.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/virojalijudimenaniligoxu.pdfIn PDF document text
    • http://delunabiwefepef.22web.org/69675937162.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/wOjh8he/sinuboze.pdfIn PDF document text
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/1053524.pdfIn PDF document text
    • http://kitadopitunija.iblogger.org/technology_trends_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/hbVjfhj/formula_race_car_driving_experience.pdfIn PDF document text
    • https://jowudanomigi.weebly.com/uploads/1/3/1/4/131455141/vumavamemus_jokane.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/11698929624.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/9768178.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/xurobibiwogidabewuti.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/cbd2e6ddb83836d.pdfIn PDF document text
    • http://tarezirok.mypressonline.com/gabakavegusefob.pdfIn PDF document text
    • https://modofanapaf.weebly.com/uploads/1/3/4/6/134676621/3560631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zisajevejeniw.epizy.com/hbse_compartment_date_sheet_july_2019.pdfIn PDF document text
    • http://dadinubu.rf.gd/spelling_words_for_third_grade.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/50820760917.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 5628 bytes
SHA-256: 58c9c09f92e14220c9906fe39574b4cbed11354767fea7487f6e4ec4a1979610
font_01_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 11328 bytes
SHA-256: 027298d42db03358cf00ce9871f0001bf5a2f19bbe435a9e8317e11e311a36bb

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