Malicious PDF — malware analysis report

Static analysis result for SHA-256 82988c565f5d604a…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 16:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5386b49a9dcafc222ed35ce9b0e2e9a SHA-1: 9edcee66a0f6a26cc04ae87b1f61565ad002526b SHA-256: 82988c565f5d604accfe590b706088b1b2273f39ce4773d97bf139df7e01b4dc
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://zajinet.ru/wix?keyword=rna+worksheet+answers', suggesting a lure to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'Rna worksheet answers', reinforcing the lure. No scripts were extracted, but the presence of external URIs and the high risk score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=rna+worksheet+answers
    • http://hytri.com/54870541802h2pp.pdf
    • http://de-bewertung-id2842384.icu/rexusewuloviripunejome7f8ug.pdf
    • https://cdn-cms.f-static.net/uploads/4488135/normal_601f0b92b1cdb.pdf
    • http://begetus11ppz.xyz/7473442362nxsq5.pdf
    • http://prizinsta365.website/how_do_you_fix_the_incline_on_a_proform_treadmillqrd5e.pdf
    • http://creditpm.com/fevunekotufi5laeg.pdf
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe3f5b2099e9.pdf
    • http://kyrgyztours.com/9484740393dx7wu.pdf
    • http://reduslimitaly.website/vezeworenonuzuzoe68ux.pdf
    • https://static.s123-cdn-static.com/uploads/4455670/normal_6007bbc5438d2.pdf
    • http://chebsvet.ru/980430576966yesr.pdf
    • http://vidclips.design/544281884230emvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bisiku/competitiveness_report_world_economic_forum.pdf
    • https://s3.amazonaws.com/woberiz/gaali_chirugaali_song_dj_mix.pdf
    • https://s3.amazonaws.com/jadudusujuje/rimugufopewotava.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/one_word_question_answers_related_computer.pdf
    • https://s3.amazonaws.com/zifozujiwi/89891641422.pdf
    • https://s3.amazonaws.com/resisuna/adders_and_subtractors_in_digital_electronics.pdf
    • https://uploads.strikinglycdn.com/files/bbba65f5-9c0a-4197-a872-68545da815b7/stopping_by_woods_on_a_snowy_evening_appreciation.pdf
    • https://uploads.strikinglycdn.com/files/1cf89c9c-b678-4976-88d3-1d5d03b15a81/5_languages_of_love_test_for_couples.pdf
    • https://uploads.strikinglycdn.com/files/cdf50316-5143-4bd9-96e1-1492d3c2b249/alla_prima_tattoo_ink_review.pdf
    • https://s3.amazonaws.com/pegozegi/aeroporto_malpensa_numero_telefono_informazioni.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_off0000f22f.bin
4cf5056aae38d594afa2bbd3a9774271e7b868229cbd41ae76cf1eda07833c59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 4904 bytes
font_01_sfnt_off000102f0.bin
0361cfcdc46fd45101d4d06173524e806615784396ba9f18b85baa4eae75d5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10544 bytes

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