Malicious PDF — malware analysis report

Static analysis result for SHA-256 837ac007457809b1…

MALICIOUS

PDF

78.2 KB Created: 2021-05-01 20:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb66b848e151103d53a2e716ffbb9d9f SHA-1: 1f23150ba6d71725d7b84662fefa87d5e63daabc SHA-256: 837ac007457809b1f792f0831939663d086d4d96af3a93d79f1fa31dc4cd6841
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, with one prominent URL being zajinet.ru, suggesting a phishing or malware distribution attempt. The presence of 'cmd7ief2.pdf' in the document text also points towards potential exploitation or redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/strik?utm_term=the+10+pillars+of+wealth+pdf
    • http://beststudent.fun/how_to_speed_up_time_capsule_backupndtk6.pdf
    • http://ryukzak.digital/how_to_speed_up_your_computer_using_cmd7ief2.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_6000da72adba9.pdf
    • http://itdiscounts.pro/plural_form_of_nouns_worksheet_for_grade_3vzhag.pdf
    • http://latujor.22web.org/23241553199.pdf
    • https://static.s123-cdn-static.com/uploads/4376609/normal_5fe41e7a904d5.pdf
    • https://static.s123-cdn-static.com/uploads/4447
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/50751286-2397-47e4-a6a5-4b8fe25b3c7b/how_to_repair_shark_robot_vacuum.pdf
    • https://uploads.strikinglycdn.com/files/a2cfa9e4-365d-4410-9893-b869fb01ef31/como_ganar_amigos_e_influir_en_las_personas_resumen.pdf
    • https://uploads.strikinglycdn.com/files/20662d75-b752-4385-9152-8a161ed444a9/kuwurexuxofuso.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_b7d7e3f1f9464fca97ddeb5cde904814.pdf?index=true
    • https://fe951d76-5a63-422f-9363-1db0463c360b.filesusr.com/ugd/1b0481_38869276c8b44dcda9fa4115d37eb75d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41fa63a6-04d1-432a-8d54-f38cb1ea77b1/papepirito.pdf
    • https://uploads.strikinglycdn.com/files/2b367807-4d7c-4fc6-a976-27d10bf72c94/design_and_control_of_concrete_mixtures_16th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/6efbd5f0-d30b-4f5a-baea-2337ad3e37cb/18063795711.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_ca07509b5b8e47638c163ef687afc0ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/99684d79-0784-498c-b803-50c0e950711a/31106195538.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_8c01e49ee9a34e1d94857c3a8039122d.pdf?index=true
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_4bfb135303a44d73adc76d05ca9a1def.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e003389-fbbe-4dba-bb51-ff10eee6376d/how_to_pair_plantronics_3200.pdf
    • http://batogegimuwew.rf.gd/apa_citation_format_journal_articles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e516.bin
08e253a59f09646a56e4b5792a55685c693435cb309f8254fbf50fa3d456bb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 5048 bytes
font_01_sfnt_off0000f663.bin
76d836671850855c054f315252c43ae78d363968ab3c16a324302fcf93808811		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 11792 bytes
font_02_sfnt_off00011db9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 4324 bytes

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