Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc655ed25cd2eb8…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 13:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 87deac3dc406bc88ec5ff559924aed89 SHA-1: 9637f2377afee76e63a6fc688815b9bd6ceb2e9a SHA-256: 1bc655ed25cd2eb82575a959b382c5b540f8a8a4df8e2f98816b010251506dc4
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 0.9989

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://crophysi.ru/wix?keyword=ikaw+lang+ang+iibigin+july+24+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff76452ea1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_604fdf60b5a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fe7964f5c8ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421208/normal_5fc853b1a4273.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/9493165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_60276b0f84639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_600ca72d0c599.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/raritizima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411917/normal_5ff4fa5ea3995.pdfIn PDF document text
    • https://simebusuf.weebly.com/uploads/1/3/1/4/131406507/guvikeketokupa.pdfIn PDF document text
    • http://bimefuwede.iblogger.org/kuzenibolebogupemuji.pdfIn PDF document text
    • https://ximuvibimujobu.weebly.com/uploads/1/3/2/6/132695583/jaripejaviximaliwiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418178/normal_60238ca459b84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466165/normal_6003ed60b14ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466386/normal_602772e1771f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_5feb9db037fb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407788/normal_5fd84ca24c5b9.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/fb94251781cbe6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f570a2-a792-4df1-a8c2-d1095deb3c8e/noziniwabiwegaxoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81a3b55-f991-438a-81e1-8e98f8ab07b8/zosuvenipaguli.pdfIn PDF document text
    • http://mejesikuwuvaxax.rf.gd/jikusesepuzaz.pdfIn PDF document text
    • http://vewitemagim.rf.gd/samsung_tv_service_centre_kolkata_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fd4886-4c40-4d88-ab12-2f24f17e0bf7/how_to_close_out_income_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc84d1b5-c866-4f81-84d4-a95289745999/quran_arabic_and_english.pdfIn PDF document text
    • http://dabirojab.rf.gd/bebop_2_fpv_user_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 5596 bytes
SHA-256: 601fce9d9ae3f84f6c4a3c7625a4e544f7e0c576730daa12e16aef1ed2c3d119
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10284 bytes
SHA-256: e78f03d333fcf3f21075a3343d1dd410ecd3f0fc7f926970f8712ca8cd4ec638
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d