Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79893af99afe760…

MALICIOUS

PDF

78.2 KB Created: 2021-04-22 13:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49a73d1c36487823cb61aac4bf614a65 SHA-1: 7a7f8d6b80d48a5e806c46c5d846b6a36021b710 SHA-256: a79893af99afe760f3df451e9f1997caa46ca5d9713fa04f0b77db4b16ea9ee8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous external links, with one pointing to 'jumiwimov.ru', suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=mophie+battery+case+user+manual
    • https://faporipito.weebly.com/uploads/1/3/4/6/134600592/218623.pdf
    • http://danefek.iblogger.org/dirazefirumijewufumet.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/gejemufameg_sozusewipenexa_wejumerow_xodimejupu.pdf
    • http://jujokifenake.22web.org/geometry_worksheet_congruent_triangles_sss_sas.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/lavel.pdf
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/volililomu.pdf
    • http://penaleduduzib.iblogger.org/jezoraz.pdf
    • http://tusukezilineji.66ghz.com/how_do_you_start_a_homelite_pressure_washer.pdf
    • http://tuligofabuwisa.22web.org/fibisad.pdf
    • http://mofopafilubo.22web.org/72733946458.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/900ba477-72a0-4262-b947-90b98597ce01/free_printable_kindergarten_books_with_sight_words.pdf
    • https://uploads.strikinglycdn.com/files/a380b82b-2815-49ad-bd3d-3c4096f08578/percy_jackson_book_1_2_3_4_5.pdf
    • https://s3.amazonaws.com/woneketelak/kunubufelegexele.pdf
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_9738a61164e348129f78f9c48f72e1a9.pdf?index=true
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_970e0bb53134486faa71e739e04951d4.pdf?index=true
    • https://s3.amazonaws.com/gezetega/cbse_improvement_exam_application_form_date.pdf
    • https://s3.amazonaws.com/xugigabitulu/identidades_trigonometricas_pitagoricas_ejercicios_resueltos.pdf
    • https://s3.amazonaws.com/xukonakefules/bruel_and_kjaer_2250_manual.pdf
    • http://bezegorev.epizy.com/62689006269.pdf
    • https://s3.amazonaws.com/taturi/ketaravuxe.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f314.bin
8bea474b7ed7f50efb2d4b3ad46a67c8af1d7c6361020c2247ca92556989082c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 5420 bytes
font_01_sfnt_off00010563.bin
6e8774fef979fe075f22007f19680f8495eddb108875f751eb6fd12026d1127e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 11436 bytes

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