Malicious PDF — malware analysis report

Static analysis result for SHA-256 4896339f835f5ddb…

MALICIOUS

PDF

86.0 KB Created: 2021-04-08 20:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4c352e251ba3d9f1932b03bb38e3cc SHA-1: d0fc8eefa17266e3db806e9541a06b85a73c5c30 SHA-256: 4896339f835f5ddbdd6213b17001cd60839726c6733fb190f04ce143e1ca927b
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to 'nipisod.ru', which is associated with a lure about a calculator issue. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure and embedded URL are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=why+is+my+ti+84+plus+ce+not+turning+on
    • https://cdn.sqhk.co/vusutazomaga/bvjaheh/83043529045.pdf
    • https://cdn.sqhk.co/xasurila/ijjct7W/food_giant_weekly_ad_jackson_tennessee.pdf
    • https://cdn.sqhk.co/nugizape/gjjdhja/super_sonic_the_hedgehog_coloring_pages_to_print.pdf
    • http://gratoram.site/463092234142etnz.pdf
    • http://operationhomeplate.com/accurate_battle_simulator_free12fg3.pdf
    • http://christinaanddavid2019.com/el_secreto_de_mi_marido_google_drivefcvdv.pdf
    • http://grinallex.shop/pobotixefovubikiv0yf32.pdf
    • http://viewcreditscore.info/16834699768qreli.pdf
    • https://cdn-cms.f-static.net/uploads/4420438/normal_60311865b3c0d.pdf
    • http://itrom.fun/digital_marketing_course_in_hyderabad_madhapur63khk.pdf
    • http://idealica-italiaofficial.site/12370650822rybns.pdf
    • https://cdn-cms.f-static.net/uploads/4407994/normal_606e81adc4472.pdf
    • http://checkmyscore.info/liftmaster_formula_1_not_workingfvfqc.pdf
    • https://cdn.sqhk.co/joxusozomilo/dEielXs/escape_girl_room_level_3.pdf
    • http://stankovit.ru/dixutekijavanalosc0xn.pdf
    • https://cdn.sqhk.co/megopofe/hibwgcY/71806911677.pdf
    • http://gvidilon.ru/chirnsyde_primary_school_uniform5pamp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_d130f9c32eb0420a83fa8f3a96eda9d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ab0723f-e848-4a59-885b-041487edc00d/miruvusezozena.pdf
    • https://uploads.strikinglycdn.com/files/9b3aa217-c1ae-4aac-a45d-733eb0d4e62c/fumopop.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_e7096860c7d142a7b2ae8f1e43eef4d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5ae440d-c306-46c8-b407-5452102954ac/migabogaxuf.pdf
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_f5d7f33395df420188db682beb8f8a8c.pdf?index=true
    • 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
    • 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_off0000f6e3.bin
d98354686f67d938a4295cf5635250efd6500ee1d0dea49ddd83b521ccd49387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 5532 bytes
font_01_sfnt_off000109b1.bin
cf284069c62a661c36109804c5b3ec767349f48d8977b68319d8a743a46ba5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 11952 bytes
font_02_sfnt_off000132ae.bin
eff505afb8e26c38bee6bcfe2a1fe7ec06ef672c1b18ea48f40a557974472291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16204 bytes

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