Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef12db92bab592a…

MALICIOUS

PDF

100.0 KB Created: 2021-02-12 01:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f783ce958ade720e7da71f6154a85741 SHA-1: c32b7e6da7e995b416e62fcc9c1759800cfdb920 SHA-256: 1ef12db92bab592aa5819a9d0d27f05e6f045f0998e47836e383ec7bd4571658
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://jacksth.ru/wb?keyword=oxidative%20phosphorylation%20pdf', which is likely a lure to a phishing site. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious resource, consistent with a phishing attack delivered via attachment.

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://jacksth.ru/wb?keyword=oxidative%20phosphorylation%20pdf PDF link annotation
    • https://selijemex.weebly.com/uploads/1/3/5/3/135335383/niwulipekakofigelim.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/zebamuza_gotaxakulix.pdfIn PDF document text
    • http://rotelebi.22web.org/garnier_sheet_mask_vitamin_c.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/milixiwemetegosi.pdfIn PDF document text
    • http://wulodab.iblogger.org/bacon_lettuce_tomato_sandwich_nutrition_information.pdfIn PDF document text
    • http://helpcreditscore.info/chaka_khan_through_the_fire_songhzjq9.pdfIn PDF document text
    • http://tojumuwuluso.iblogger.org/realidades_2_capitulo_1a-_3_answers.pdfIn PDF document text
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/6879248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopinakitiwodad.rf.gd/c_est_la_vie_movie_free.pdfIn PDF document text
    • http://juzelipa.rf.gd/tda2030_audio_amplifier_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/meeting_plan_template_excel.pdfIn PDF document text
    • http://lisunamubeso.epizy.com/android_auto_mazda_mx5.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/chiltepino_s_pabelln_reforma_hermosillo_son.pdfIn PDF document text
    • http://lidazadopedu.rf.gd/99549263160.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/rocky_2019_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/guided_meditation_for_pain_after_surgery.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/19571083223.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/rigotozilutugofabunela.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 5384 bytes
SHA-256: 43dc96f8d106886563696b3762e30cb9a5cc467b31f928a1480d2440dc7e2c5a
font_01_sfnt_off00013e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E95 14832 bytes
SHA-256: dd6ea4f55d4d5d95df4e6eed9138c9f0e75224a09bbfa3d8ce9fa5c3ec8d5dd6
font_02_sfnt_off00016bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD4 16128 bytes
SHA-256: a492b4f59d97a8153a546570828a62261a626e14021681de7113f490fd942130

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