Malicious PDF — malware analysis report

Static analysis result for SHA-256 163862553b603a1d…

MALICIOUS

PDF

70.6 KB Created: 2021-04-07 13:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bcffbc51f5fe58533f9a020324ef152 SHA-1: d7a68759085177e82c5a6e11034cd524ec4e5d06 SHA-256: 163862553b603a1d6b8bc65404276bf443ab6c242ea061cc02e1a07bdf085f37
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a search query for a textbook. ML classifiers and ClamAV also flagged this file as malicious, specifically identifying it as a phishing trojan. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=prentice+hall+geometry+common+core+textbook+pdf
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/riwab.pdf
    • https://pusakinadolelu.weebly.com/uploads/1/3/2/6/132682110/jegobinatuxes_jopizeba.pdf
    • http://lnstagram-copyright-supports.com/ridipuxjxz3m.pdf
    • https://nowawizerazez.weebly.com/uploads/1/3/4/5/134519823/4994765.pdf
    • https://cdn.sqhk.co/wagomito/yjd8Xic/sogixusidig.pdf
    • http://honbiz.pro/programa_civico_para_honores_a_la_banderaz6fwl.pdf
    • http://stankovit.ru/polizuzajilerabuzotxg1.pdf
    • http://juilopkiretlo.ru/369694748307k81y.pdf
    • https://cdn.sqhk.co/nuvexajamu/hdnY5gg/pobosadenipove.pdf
    • http://dresdenpharma.ru/you_are_the_message_roger_ailes_audiobookfgfh7.pdf
    • https://cdn.sqhk.co/pigalixow/dsvigif/kapuki.pdf
    • https://cdn.sqhk.co/wukatigubo/chfjeig/bubugifu.pdf
    • https://zalogarigi.weebly.com/uploads/1/3/2/6/132695681/sanalobelox-fipatam-nibapedofas-gavat.pdf
    • https://cdn.sqhk.co/roretuduva/hdVRuPj/make_a_cake_cooking_games_similar_games.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tutakaxebi.epizy.com/an_ember_in_the_ashes_book_2.pdf
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_4e85d258a7b44df6ad9dbd7aa3a0a903.pdf?index=true
    • http://virawumeritaxo.rf.gd/80214407654.pdf
    • http://wipovevoliku.epizy.com/gapomokilinakozonaf.pdf
    • https://s3.amazonaws.com/legapatatezisa/how_full_is_your_bucket_spanish.pdf
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_5c32e67731c148acbd51c0598ee7f7e8.pdf?index=true
    • http://famutiparuzot.epizy.com/latest_discoveries_in_science.pdf
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_a3178149bc5e4680a1331e5bb87db717.pdf?index=true
    • http://sisuwilir.epizy.com/jiwaler.pdf
    • https://s3.amazonaws.com/kofabube/37180137565.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_4a03093ed35a4e25982ec16b232c5664.pdf?index=true
    • 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_off0000d511.bin
d66346153fe798471d64ceea59e1eb216f8066d1bf328e3f2f1d820a008dcefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 5768 bytes
font_01_sfnt_off0000e897.bin
45cfc991f0addef594f127cf9632badf18e844118a899591ad2133717c7ea7b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 10528 bytes

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