Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d1c6986281bbfb…

MALICIOUS

PDF

88.3 KB Created: 2021-03-12 16:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 883f458b4ca24bcfc2091c90199d3b3e SHA-1: 8046d4f3747d4c1f468a93371b3c2636106cb245 SHA-256: 16d1c6986281bbfb1a45f84e0b8b7ef62a7bc2f49ad1f54a15d1584a43efa080
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=hola+launcher+apkpure PDF link annotation
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/f0550cc2cc.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/ujjgcif/peaky_blinders_season_5_kickass.pdfIn PDF document text
    • https://vuwisirikufav.weebly.com/uploads/1/3/4/7/134765545/c61f3eb5e62b1ef.pdfIn PDF document text
    • https://lanudoda.weebly.com/uploads/1/3/2/3/132303217/9810741.pdfIn PDF document text
    • http://depozamojazuj.22web.org/61505497811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_6014592f215dd.pdfIn PDF document text
    • http://jitoletesavi.iblogger.org/utorrent_free_for_pc_windows_8._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60365c8d38d8c.pdfIn PDF document text
    • https://tomavibevojivow.weebly.com/uploads/1/3/4/0/134016690/9066952.pdfIn PDF document text
    • https://lebugaboforov.weebly.com/uploads/1/3/5/9/135976333/1069061.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/2ih3LYm/22798368523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/divexikav/gutuvafuluno.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_8cfc74d40019419093f8f4acf95598af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/learn_chinese_in_five_minutes_must_read_out_loud.pdfIn PDF document text
    • http://funazowo.rf.gd/access_master_garage_door_opener_battery_type.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_c3b49b5948be4460adb2de4540af3f9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/59273296889.pdfIn PDF document text
    • http://jugorufu.epizy.com/high_level_timeline_templates.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_8b1fca5508c64375b559599adca63cc7.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 3260 bytes
SHA-256: 054faadef2c537ceffe70505418980bd837690053e068efadc575368c84576ee
font_01_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 4868 bytes
SHA-256: cb6fb98b412780a89df89f93fb18608422d96d39ccc5ccb42aa2e1524e18e30d
font_02_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10340 bytes
SHA-256: a1e084071d428c4a5f83d339d5aa7163b4080c25bb9e5372bef7e590dc913a82
font_03_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 16264 bytes
SHA-256: 68de6d6b34629de777ab3ab8a9f134c855f305daa617ab346a3ffef9837f5fc7
font_04_sfnt_off000138a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A8 8020 bytes
SHA-256: b5e2bf26df61807ec03e966444b2ff05bf739390cc0ba685e00a859a814e5d6c

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