Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bd7b856fc705bf…

MALICIOUS

PDF

336.0 KB Created: 2021-04-19 12:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09a30c0730c8f9614551183fcfd37f7e SHA-1: 744bd8e03e4eb37838856950389ef7e65a4c8b4c SHA-256: 85bd7b856fc705bfd6b9a51a588747294adf31659fcceaf8e0ec23ebedf7a641
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a secondary payload or conduct phishing. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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=reading+into+a+new+china+volume+1+answer+key
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/5721990.pdf
    • http://fujavexawagul.iblogger.org/pdf_to_word_converter_offline_apk.pdf
    • http://tiboxul.iblogger.org/behavioural_theory_of_counselling.pdf
    • http://berozava.iblogger.org/meditation_marcus_aurelius.pdf
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/bb5d33d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.thdl.org/http://www.thdl.org/Tibetan
    • http://www.opentle.org
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_5706641c039a4e0eaf46dbcd6ceb3043.pdf?index=true
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_c96c0e81a98a4827a09d7a31585715a4.pdf?index=true
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_9b6870b68d3746f4992f42d5bf16a1cc.pdf?index=true
    • http://kakogajoxe.epizy.com/demupobawifarukur.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_9a2a8acb808840c293b79361495a7336.pdf?index=true
    • http://tisuvelepep.rf.gd/31412835014.pdf
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_5a14754237ce4c71a7baab8eac7ba734.pdf?index=true
    • http://tenefotozefuzuw.rf.gd/nikulufa.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_4f30d0e4d01644858092de015b9f2e8a.pdf?index=true
    • https://s3.amazonaws.com/kavalukato/404740752.pdf
    • https://s3.amazonaws.com/xupovobejanam/15836204977.pdf
    • https://s3.amazonaws.com/vovopafubipu/64756778060.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_a884caf7a40140468afabc8cd0e2fb64.pdf?index=true
    • http://dimavaju.epizy.com/hampton_bay_e75795_yl.pdf
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_e04dd80b2b564bb5b80a93afb29474e7.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_a58f234f94f74bf1ba79f803eedb8440.pdf?index=true
    • http://pugetuwozijeso.rf.gd/agile_software_development_life_cycle.pdf
    • https://s3.amazonaws.com/vaxebisapesi/harga_casio_illuminator_ae_1000w.pdf
    • http://vagenudutuxa.rf.gd/31154405978.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://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.htmlTibetan
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002783c.bin
260d21381fa2e3f7c256fb61b1a1bc3ab197c510b25b7f637980124ee10a4e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2783C 193400 bytes
font_01_sfnt_off0004af4a.bin
e8cac2e0dd51ce1da6dedef73993fe22ced7e0f0daa4e5c9ba8c0d9c682f049c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF4A 5732 bytes
font_02_sfnt_off0004c2cd.bin
5597e554b9fd38a7e852fb26ea64def6af6a4c123a825ef13b69613c5cdccc9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2CD 9800 bytes
font_03_sfnt_off0004d72e.bin
72bce22896e3d94bd644bc9b17edada1c2877f4834641a5391c3927c8114f514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D72E 14136 bytes
font_04_sfnt_off0004ffe2.bin
1cf26a7f75ddbfe6050c5b4e407f4ec3eae46f5af1ec6587381d06021cfe5fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFE2 16728 bytes

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