Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31385498339c2c2…

MALICIOUS

PDF

86.6 KB Created: 2021-07-22 14:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11c38015c16f75425bc4dccfd240f858 SHA-1: f3117bfa95cf914ba38fa111a0c5123cc8cf4faa SHA-256: f31385498339c2c20647f8652442175895ece729cf120a0f51e90edff926d9e6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a phishing site. No scripts were extracted, but the presence of an external URI in a malicious PDF strongly suggests a phishing or credential harvesting 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://nomylo.ru/square?utm_term=middle+school+track
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e878c29603dd5638ff32dd/1625848002225/nefolelo.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec79e2288cf71862a8934c/1626110434721/14796696124.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92324854c1d3b34870550/1625891620628/28691416810.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f82344d172c44902d84cca/1626874692446/black_paper_for_goodnotes.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1a3e6f028704100438f6c/1626448870379/88109218453.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f250a62e59700d3e53ae7c/1626493094874/problems_in_the_world_for_youth.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f7379091785628c3376346/1626814352764/10th_class_telugu_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8efa973f9128ac6baf50/1626115834647/wikagibonopibakurolu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e91535e6a58043b6911ea3/1625888053361/80171409581.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e81c607e45264421fb4290/1625824352374/benozurobemakarixaxo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec921e4f2b1c51afa4ea9d/1626116638522/54239698142.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3ba43c5d9e6782ce5f127/1626585668034/how_to_find_integral_zeros_of_a_polynomial.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f342f37f94c710fbc4f338/1626555123688/83864008231.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ecd2b22746a40efc756248/1626133170692/fumafuwibadigovuvidalasa.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4146ece637c2583415524/1626608751040/mobuf.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edd8354485e42169013542/1626200117606/the_calvin_cycle_produces.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f628394742d44d706e2a26/1626744889525/gijakorutuvepi.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f31b47731d8c7c6ffa28fc/1626544967313/wuxufidobudexiloxe.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc5d59942ff19c764fc2f/1626195414000/king_charles_spaniel_and_poodle_mix.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f65fd93ca5073dfd63f2a9/1626759129705/64810647155.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 16792 bytes
font_01_sfnt_off00010b3d.bin
022f1c73590cb7fd908fb23d9b8ed4644228394d7ce8cfaff961438d2e4393dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 16016 bytes
font_02_sfnt_off00013484.bin
3f1473de49d782133eb8c1efee7efdd1e23fac3f4b891e8f864c8664365a5f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 10448 bytes

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