Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e618b3d6a9ba458…

MALICIOUS

PDF

82.7 KB Created: 2021-05-18 16:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c76d42355c12e16b89da0db4a39749b1 SHA-1: 17f8a908c9f933f1f566fa262ad45bfd2c9782d0 SHA-256: 8e618b3d6a9ba4586bad20ccc543eaf1c2e0c48b6dd7653f89e88aa191a09bd5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=caller+id+changer+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383136/normal_6041ac42a5703.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/sifumi_pijopovigoliwe_rojepavilowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_605a7cb81fbb1.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/kazeteb.pdfIn PDF document text
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/pugokegu.pdfIn PDF document text
    • https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/vogefoponononig-pabokegilu.pdfIn PDF document text
    • https://wawowipibi.weebly.com/uploads/1/3/3/9/133997364/mevaduj_padulelametojuw_gebudasugukat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_603cb573812a0.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://uploads.strikinglycdn.com/files/1b0863df-59b6-4a21-8307-8e617a98cf13/83643493141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a16bca-54d0-436d-90fb-d6c4eb22ca34/braun_exactemp_pos_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ddee22-d3eb-449a-ac85-34bfb8abe1de/john_deere_mower_bagger_chute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b28747-732b-43c5-b3de-e25528c818ff/22827592920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d372bb-dc55-4e8f-9f31-54799f2d4a3f/18690425992.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/best_background_blur_camera_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9367f728-4289-459c-999b-e038d7ddba98/nemofiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/recommended_oil_for_honda_eu2200i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d38c89c-001d-4eb2-8b7a-20ae25191cf7/21805595766.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/does_iphone_5c_have_a_sim_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc053ef9-bc86-4835-8d99-f1e0f56c6cd3/55381367362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd91a0df-9eae-45ac-bfda-d53a73ca07cf/best_digital_tire_pressure_gauge_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44552656-ca9c-4570-866e-da4eb768064f/ca_dmv_audio_test.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 5276 bytes
SHA-256: e283bbdadac5d571f5cdae6d90a3b233d117ff7cbc5f14518ebee08cc50638a9
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 11548 bytes
SHA-256: 2a809c67e2c4d3a7241dc2920667938b1858d08ba797cf2a464c2d75c6d48d32
font_02_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e
font_03_sfnt_off00012eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEB 3000 bytes
SHA-256: 03f290627b0790dcef7cfce21163d98eff4319f2c3035dabeac63494783b01d1