Malicious PDF — malware analysis report

Static analysis result for SHA-256 119ca4e512f1ebc0…

MALICIOUS

PDF

77.0 KB Created: 2021-04-25 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02c6bae51d326f5644e25c191e9f79d0 SHA-1: d121915a2b9766b7ce08841aa1e43cee88f32a16 SHA-256: 119ca4e512f1ebc05984155ef18a717d6a24c5a619b64d4a44c3b5662d12c471
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, 'https://midufefew.ru/strik?utm_term=how+to+use+a+ti-84+plus+calculator+for+fractions', appears to be a lure for downloading software, disguised by a seemingly educational query.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=how+to+use+a+ti-84+plus+calculator+for+fractions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410731/normal_605d8e722c8c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6047b40a1bc71.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/dupiz.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/best_budget_dd_wrt_router_2020.pdfIn PDF document text
    • http://tofugezupeb.mygamesonline.org/rafes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_6030f55110a33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcce39ae3f31.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/what_was_happening_in_america_in_the_1870s.pdfIn PDF document text
    • http://disozire.mygamesonline.org/8303989037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fda71b257f99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aef640-feb7-40ab-8506-39deb9f03a63/nitro_reader_3_64_bit_free_download.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_8ca9b66b9ee940d1ae78b4802f1f1536.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_2df65ee82dc0439d8839df755737fb07.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_6ef3630f6fa34ccbb6a75de39fdaa8b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/fifetisasuxanukaf.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_698da36bd0504428859e6f9d5d01047b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28324f01-5578-45d8-87a3-0256ac69e9bf/vesegujugapati.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_6c9b880880d04cc0836f964935e9a0f6.pdf?index=trueIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_5a93d1c5210346ea987bedf29798d689.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d663e16-488f-4ceb-b083-0a1134231179/billy_elliot_character_analysis_michael.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_a33e4c60a90d433bb4c14a6a3d787c44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25c055c-958b-4369-87c4-f13db8f51568/understanding_space_an_introduction_to_astronautics_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa2f676-6731-4f9b-94cf-aa4260cb1ce4/5527301867.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_d0397ad9128241ed95673b2231a337f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/brookstone_outdoor_speaker_manual.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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5376 bytes
SHA-256: fd606218181b12dfc875e7831d3000129f31b0c7bf4d7a2b32a95ea35a52f06a
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10492 bytes
SHA-256: ab00144ed36a2ddb0ea2c9daea7f03088167f2f6cf3d78a3372299ad11994ec0