Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef3396b1744253b…

MALICIOUS

PDF

79.2 KB Created: 2021-07-16 00:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27977382141c6b8311c31410f801d901 SHA-1: 4695fd04b78e19d9c1387583b720c2dd86ff961f SHA-256: fef3396b1744253b70cc05d7847dd89cbc9f62dacac7f7a131e67852a006bba0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or exploit delivery mechanism. The PDF_URI heuristic points to an external URI, which could be used to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://feedproxy.google.com/~r/sq/ugae/~3/UZrB20b2Dcg/square?utm_term=affirmative+action+mean
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0a2f3ed8b8a523b8b60b3/1626383091235/nyc_dmv_test_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e78df08592fe3a588d0f82/1625787888955/40725568478.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e81ae65c13cc4feded47ff/1625823974157/why_does_love_hurt_so_much.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee819a2ee8b51fd9392002/1626243482765/rabotuzed.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8207e9cbfe6c2febd094/1626243591765/energy_transfer_from_one_object_to_another.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e77649ed8d191f65461017/1625781834058/nasikalijezizevosulilez.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eff9d7177a4e2836d32a9a/1626339799207/what_countries_made_up_the_triple_entente.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec93bf0f7d8d50062d1e7b/1626117055719/family_guy_old_man_fight.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e922882f3c4128e18a49a1/1625891464567/limifil.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f079fcf02e551ecfa51db4/1626372605216/zizubironefatipapeki.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7ad1ca3609a707ba9a7ed/1625795868555/act_geometry_review_problems_answer_key.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_off0000d4af.bin
c8f7e462d621a57455a92db6841ce34761b76c51d17a4b444041699307d84073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 16516 bytes
font_01_sfnt_off0000ff91.bin
07beba530ffd16f0f34facff5107a7aa596aa5145f397caaa304251a57c5aa0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10332 bytes
font_02_sfnt_off000116ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 16792 bytes

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