Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1473f33c91798c…

MALICIOUS

PDF

110.9 KB Created: 2021-06-03 09:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2d44669affb3074e355c1c7876f8190d SHA-1: 30025643a597cff54fcf1479a237be3a499d6aee SHA-256: 2c1473f33c91798c9908c4ad6a6a1ef8d95b1809ae58b7526bead8126a094ecf
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 0.9991

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://coretry.ru/pbw?utm_term=padman+movie+download+in+tamil+dubbed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412377/normal_604cd618eb6cb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468572/normal_60b3a78e93ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd676a9a465d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60571b954fa44.pdfIn PDF document text
    • https://dosemawa.weebly.com/uploads/1/3/5/3/135388865/1331269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd652f4d37a4.pdfIn PDF document text
    • https://xazunavawotop.weebly.com/uploads/1/3/4/7/134724639/3621242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388824/normal_60058392e22dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_603e675202367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/799d41ce-4cbd-49c1-bd36-2ee3c79c70c5/audio_driver_windows_10_64_bit_asus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1369fbf-822e-4b74-bb13-06dea816576e/filoles.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/when_did_all_i_want_for_christmas_is_you_come_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a752bf-5ed3-404b-be46-01f946fe7aad/88843884283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50180eac-c6f4-4d65-adbd-ec4642bdfdb9/15596326819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecf859d-687b-47c3-8abb-61080f0286b5/what_type_of_organizational_structure_is_amazon.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144442287/58756258634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffd8f0f-e9a4-4153-a85b-d615dbca840f/93007365392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b558fb26-2397-4dcb-a140-2a813a6202de/fogosanedilafakob.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 13112 bytes
SHA-256: d82a3deedf911b561d49474c07ed180c1e712aac620043ccf4396b16d739cb4a
font_01_sfnt_off00015092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15092 4872 bytes
SHA-256: c97a8bfeb000f3f26488ded3f0c8cbd9e190fb31ecffde2dea55e17c8ab54f94
font_02_sfnt_off0001611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611C 12012 bytes
SHA-256: 27c7331bcf5f7af7c24f43bdb3edf62442a1b4f72d228fe80f98d8daecc4c0c6
font_03_sfnt_off000189b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B2 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6
font_04_sfnt_off00019ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EC9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c