Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3153df44e60e0…

MALICIOUS

PDF

86.7 KB Created: 2021-03-27 21:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0394491d4bb882d2ab8ac0df446407c9 SHA-1: de05871146c03854b16da214aa3d4bc8bdccda12 SHA-256: 6aa3153df44e60e06aadbdf59a239a8c758db5ca1dfab4829cba617c37ed280d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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://midufefew.ru/award?keyword=malayalam+calendar+2020+july+pdf PDF link annotation
    • http://sebofafekorav.iblogger.org/android_imageview_onclick_example.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/nirijepekekig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_601d58fd65abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fd8af6ecbea2.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/highways_england_appraisal_specification_report.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/tuwunututata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393486/normal_60013377c2330.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/fairy_tales_stories_in_english_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_604ced7d98578.pdfIn PDF document text
    • http://movigakamemik.22web.org/28361580286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_602b4e82752bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc43a2c7-f057-4193-8191-b894e1a07586/sezudagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b743cd-9b3a-438e-b754-598a3cb01c09/923044775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe3fd1d9-0420-4486-9c07-ba795844e33d/kenmore_heavy_duty_70_series_washer_will_not_spin.pdfIn PDF document text
    • http://rolezudebozi.rf.gd/28896879275.pdfIn PDF document text
    • http://jufafiwosekugon.rf.gd/hardy_boys_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15a9b7a-ee6e-4b81-99a5-a0ffb5a22414/masimo_rad_8_pulse_oximeter_manual.pdfIn PDF document text
    • http://tuzotulerijenej.rf.gd/masterworks_zelda.pdfIn PDF document text
    • http://mefowoweman.epizy.com/android_software_update_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69addeb-8a55-4a5b-8b4c-08cad3f5ab19/zidajenujufadasegefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0115fc37-87c4-4d72-868a-c75a3f11784f/amazing_spider_man_1_comic_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee4ae43-6fe5-4656-944f-37545ea349ff/94408049278.pdfIn PDF document text
    • http://gonuwufif.epizy.com/icivics_limiting_government_worksheet.pdfIn PDF document text
    • http://nenilezum.epizy.com/2020_cbr1000rr_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1fbfd7-3505-452f-83b2-35703a567b42/42315424799.pdfIn PDF document text
    • http://sekijipaladi.epizy.com/45961870052.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 5580 bytes
SHA-256: fbf03ce97a13671feaf565b45b632d70aa9fe1a92f371812011ef3948a736f92
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 6036 bytes
SHA-256: b616fe12363fcba74c20e09fc1b091791d9f1f78e95a91d2793eda24b6650986
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 9832 bytes
SHA-256: 8256becf8d784b88a4898cdb3d74f7dd264df27d5179619cd425232e74b9dea1
font_03_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 16164 bytes
SHA-256: c1ba3419a5370763aa1b75259a63cd33ed14e5a3d70cd71e8a04aec8eddd74b8

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