Malicious PDF — malware analysis report

Static analysis result for SHA-256 9679583956cf2e56…

MALICIOUS

PDF

84.7 KB Created: 2021-07-22 01:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b784bb991ddd94f01b0b99fe2b43c3e SHA-1: 779440dc04c178716f6d85288dd9e5bdb96e503b SHA-256: 9679583956cf2e5651370a9a0882717e26c3fa11b91e4ff0f4f9a4bf730d46e4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to redirect the user to a phishing site. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/square?utm_term=odoo+implementation+proposal+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8b8720781e4bb11cc4be/1626114951424/isaimini_dubbed_movies_2019_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec98bbaf807f1e15273cec/1626118331233/27930948623.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9d331374dd6a9a637104/1626185011321/meaning_of_flutter_in_english.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f6b111e03aea67d4a0d46f/1626779921344/how_to_delete_and_add_text_in.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f11734347a2e2c84fef509/1626412852305/cold_occluded_front.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8adbe12383e52639f4115/1625861566364/how_to_do_chicago_endnotes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f88cd715b3010569c607e7/1626901720191/5755647702.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f88f82aa32ea2fffafb3cd/1626902402767/73104609273.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8105ad1bf7105ccb9f74/1626112261756/xiwuzajogadutugi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e86e640c43fe23627efc7a/1625845348378/puzidol.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efd9c81e1a563dfb8c45b4/1626331592869/choose_the_correct_option_write_the_answers_in_your_notebook.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee79d52d09e34b72a36c03/1626241493717/f1_manager_mod.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f7164c2eb49b138e65d741/1626805837112/mudonujapu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee1f27b27e5958d58cf223/1626218280090/70172544604.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f8900a6c04540b03072224/1626902539013/lujamuperamubebageku.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e944bd0cbdad4d3506e184/1625900221350/ff14_best_way_to_level_crafting.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0c5e05554232196b6eb4e/1626392033170/nosoje.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8094095719b356d94984c/1625819457018/5.7_a1c_level.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edadcec8312e4ee1dfe47a/1626189262880/what_is_communism.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3c60b0b1749089212ec5c/1626588683474/29658369315.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eca6cd704a383bbedcf3ba/1626121933182/78197109111.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f8a2b47f728b6ca90481c1/1626907316341/thanks_for_watching_intro.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f06bc63f5e7b0f5ec381a4/1626368966549/accounts_that_need_adjusting_entries.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4b6671434f6354733b3c2/1626650215810/gimuvefanagenebumebopa.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed8d583b21860fe672ddb2/1626180953046/35436581736.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_off0000e740.bin
436a41abac1ce239047858c2418cc01cff44ab51f6c5613f3432baca2670f47e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 16556 bytes
font_01_sfnt_off00011200.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16792 bytes
font_02_sfnt_off00012a17.bin
fb20aff70019dba20d7fcb8216651a2e59d5b9e6c390e8769acc80015150d3b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 10684 bytes