Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd9dbc1a4cdc53b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-19 06:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63e3efd12a1b2c994bab8315a0538623 SHA-1: d5e5636a74cb6c72e377f7385caa6f99db40e223 SHA-256: 4dd9dbc1a4cdc53b8fa31ad112d2d76f901279396bc47b15f4c7308522ccc26b
96 Risk Score

Malware Insights

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

The file is a PDF that masquerades as interview tips to trick users into downloading it. It contains an external URI pointing to a suspicious domain, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=upsc+interview+tips+pdf
    • http://mixutadumekaje.mypressonline.com/jegezip.pdf
    • https://cdn-cms.f-static.net/uploads/4446272/normal_603e897149efe.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6033e7428c9ff.pdf
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/5877536.pdf
    • http://zutatowatipo.mywebcommunity.org/candy_luke_davies_download.pdf
    • http://mevukavotidu.getenjoyment.net/2407083148.pdf
    • http://zijaditenup.getenjoyment.net/fatobakaf.pdf
    • http://gonalotuturopil.mywebcommunity.org/84899697149.pdf
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/f80663b50a.pdf
    • http://fisujerekuvij.getenjoyment.net/cartello_vietato_fumare_2020.pdf
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/reponesewaxezi.pdf
    • https://wodelegijulafa.weebly.com/uploads/1/3/4/6/134677223/735048.pdf
    • http://jigikujed.scienceontheweb.net/taking_sides_clashing_views_in_abnormal_psychology.pdf
    • https://bubokadorododu.weebly.com/uploads/1/3/4/7/134758236/668ec500.pdf
    • http://winovigamaj.mygamesonline.org/movirimufazesawaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tuxutedi/schengen_visa_online_application_form_france.pdf
    • https://s3.amazonaws.com/lusegokaves/vogiviwaguzawiwiwagusib.pdf
    • https://s3.amazonaws.com/tetenifeme/52435784492.pdf
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_01c7b958f63c4a279e5ba4f3af1bcd67.pdf?index=true
    • https://s3.amazonaws.com/zetituri/61152318468.pdf
    • https://s3.amazonaws.com/zetituri/how_to_turn_on_ps4_gold_wireless_headset.pdf
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_f008053dec5b402ea0e979f03d16b975.pdf?index=true
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_e7ac1ff787f34a47b3090bac465ff9cc.pdf?index=true
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_faf5215443294b9e9fc35f2ab051255b.pdf?index=true
    • http://newemepakirid.myartsonline.com/martha_graham_biography.pdf
    • 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_off00011152.bin
06c704d5078ab3cb08e52e6a17a8376e952d3349a54c0c105a6ba6ff868f2828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 5052 bytes
font_01_sfnt_off000122b0.bin
e26449d7cce03bdbeffab80aab4145da5311338a60f4ec663e297bb67585a106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 11156 bytes

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