Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6931421e2c18f88…

MALICIOUS

PDF

77.8 KB Created: 2021-04-12 14:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e6a9f1a92dccf5e3d6e62def2cd659e9 SHA-1: 404ca5ad6d38d2fc84858d32946e6319f3c5e06d SHA-256: a6931421e2c18f88cc42c2ebff66330f43ea2797064d34522d5dde127ba1d9a4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, including one pointing to 'nipisod.ru', which is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=blessings+come+to+those+who+wait+quotes PDF link annotation
    • https://cdn.sqhk.co/bovavadas/HbJKieA/57749039952.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/hg2lhg8/bezegonoxivokepumag.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/10367540063.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/aijgjgf/nikakejataloxetoxoru.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/igJvhdt/hungry_runner_jangle_runner_running_game_clothing.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/character_development_in_film.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/91719420948.pdfIn PDF document text
    • http://wififej.mypressonline.com/26382571148.pdfIn PDF document text
    • https://cdn.sqhk.co/madobeborozu/pij7Vjf/54054040457.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_4446ef1b3c3343709c5e0e07b9dd40a0.pdf?index=trueIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_4776d48e759040b9918a5803f5bf7b74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukazowox/vawodabowubudo.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_a7e15510800546d08173f5410028c82d.pdf?index=trueIn PDF document text
    • http://pexofapu.myartsonline.com/lks_barisan_dan_deret.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/eternal_sunshine_of_the_spotless_mind_script_analysis.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/capricho_arabe.pdfIn PDF document text
    • http://lifobem.myartsonline.com/59124677288.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_e6ac278443d84d73808f6500fc6c80eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rejiner/depavesikitamawowuwodipop.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_80757abbc083401aa7000146f0638e84.pdf?index=trueIn PDF document text
    • http://jujuletofu.onlinewebshop.net/agnello_di_dio_buttazzo.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/3418599927.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/sample_leadership_assessment_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/zoger.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/2020_subaru_impreza_consumer_reviews.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 5384 bytes
SHA-256: a714cd3cf30268ed4fcbb2a8a7e0a38d81b541e4b87e65fbdc1596764ae2cd21
font_01_sfnt_off000104bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 10812 bytes
SHA-256: 1628999ee043889f050786f4d9fd8855be18db5a92db9c6f8f93fb204a3356da

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