Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fc80a27eb57146…

MALICIOUS

PDF

86.8 KB Created: 2021-03-13 17:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0027196dbe2deb1a3e042f3c7bf3395 SHA-1: 1ed2b16d2a99023f45c5b8f443ab434bb05bd04b SHA-256: 82fc80a27eb57146743a8665dcb1acc82fccbc8e2c29655b732e41fe343f10c8
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to appear as a legitimate document while directing users to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/award?keyword=deadline+definition+pdf
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/degorogigekut_jibiwofew.pdf
    • https://suxobiras.weebly.com/uploads/1/3/4/6/134614615/9862586.pdf
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/melezo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_727159e0588d45618d181ca9bda1a6c6.pdf?index=true
    • https://s3.amazonaws.com/zarevizebi/56304339008.pdf
    • https://s3.amazonaws.com/tudawufed/malwarebytes_anti_malware_free_for_pc.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_8755b5bcb8d840f49ead9d051129e131.pdf?index=true
    • http://jomezibu.epizy.com/5299586768.pdf
    • http://revipopeguxasaf.epizy.com/how_to_use_instant_pot_duo_nova_water_test.pdf
    • https://s3.amazonaws.com/mizeteb/cuisinart_k_cup_coffee_maker_clean_light.pdf
    • https://s3.amazonaws.com/xugigabitulu/adobe_premiere_pro_cc_frame_hold.pdf
    • https://s3.amazonaws.com/topipovikapari/complex_numbers_ncert.pdf
    • https://uploads.strikinglycdn.com/files/fa097b6c-5418-4d21-8833-0c951be35412/how_to_create_a_yoga_sequence.pdf
    • https://s3.amazonaws.com/vufuzewasi/714525223.pdf
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_a16676fa657e44a9acb27a61351f4c85.pdf?index=true
    • https://s3.amazonaws.com/vutame/apbn_tahun_2016.pdf
    • https://s3.amazonaws.com/dazuxujepov/how_to_learn_the_nato_phonetic_alphabet.pdf
    • https://uploads.strikinglycdn.com/files/4fd11a0a-09e7-4ddc-9cb2-bcd2e07152a3/how_do_i_book_an_appointment_at_an_apple_store.pdf
    • https://uploads.strikinglycdn.com/files/e2a99ddb-a31b-40db-a3e6-b98560dbaf40/how_do_i_get_a_replacement_remote_for_my_vizio_tv.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_8c75af9d263f407b9f353f21c13c7c18.pdf?index=true
    • https://s3.amazonaws.com/kodipopujufipig/hutchinson_mn_police_report.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f247.bin
15f21214dbdbe9fdcf60443744ade12c11242f0e715c59c2d3eb4142d76e3d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 4548 bytes
font_01_sfnt_off000101d1.bin
741e9793336c6c6b2e9bdc86ae1a279e3503316fbebba9c43c170e23e5623642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 12016 bytes
font_02_sfnt_off00012ae4.bin
e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16060 bytes
font_03_sfnt_off00013f77.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F77 4324 bytes

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