Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f85e527c11b8aa…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 05:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259985b5f5f2e2fbf127a8400466d92e SHA-1: 2d1fa6b98c17d7c8c2bed3b1f61e0da98531a80c SHA-256: a1f85e527c11b8aa0c454a5ff1ea87cd23cfd1edfaf660e5f2fdd9c4ab6fda6a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to a curriculum guide, likely a lure. The embedded URL https://vilenefex.ru/123?utm_term=curriculum+guide+in+computer+hardware+servicing+7 is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=curriculum+guide+in+computer+hardware+servicing+7
    • https://cdn-cms.f-static.net/uploads/4409607/normal_6045c372b93c2.pdf
    • http://nibajafij.medianewsonline.com/mapumobid.pdf
    • http://kilekapalovuzo.getenjoyment.net/apprendre_l_arabe_en_10_leons.pdf
    • https://cdn.sqhk.co/fagaxirupunu/4jgicic/light_up_keyboard_piano_australia.pdf
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6017bec8a524b.pdf
    • http://lamaded.mywebcommunity.org/94725943316.pdf
    • http://gavediteriremuv.medianewsonline.com/pidukesagugipupubi.pdf
    • https://cdn.sqhk.co/kejaxedusuk/fjiAhbo/juwabodojolidupokuj.pdf
    • https://cdn-cms.f-static.net/uploads/4402745/normal_604915ca79c8b.pdf
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5fe5d4bca8ed8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mamukawaxatali/navy_ncis_season_16_episode_guide.pdf
    • https://s3.amazonaws.com/wupiwupiwot/hemodialysis_guidelines_2018.pdf
    • https://s3.amazonaws.com/sajatofubote/avengers_offline_game_for_android_free.pdf
    • https://s3.amazonaws.com/xifabilejilab/bikawovutil.pdf
    • https://s3.amazonaws.com/pobixedele/proform_995i_treadmill_for_sale.pdf
    • https://s3.amazonaws.com/satudifin/how_is_the_tsx_stock_market_doing_today.pdf
    • https://s3.amazonaws.com/baxadelefofibuz/12032158921.pdf
    • https://s3.amazonaws.com/mizeteb/bewesemewazavidu.pdf
    • http://laxolagodofomug.onlinewebshop.net/tudurexugasoku.pdf
    • https://s3.amazonaws.com/zupenafud/microsoft_word_math_worksheet_generator.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_off0000e5d9.bin
a8096dac560e78b9ae2aad1e57fee1edbdcd91ffede7828d12b79cca73e5f9c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5624 bytes
font_01_sfnt_off0000f8e2.bin
0e5da346aafb39dc53de36d6bbd289c5f3745cdc2592c0fcdcb49f50e3673f72
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10416 bytes