Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02f1656b667898f…

MALICIOUS

PDF

86.3 KB Created: 2021-03-17 20:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0668afd8b62d216bc1012d155bb33b5 SHA-1: 5a768a28921c0888e66bf791a22a916c04c6120d SHA-256: c02f1656b667898f17540245737cdb1644784f5821169f5c91090388d4ca2b33
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-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://resalured.ru/strik?utm_term=how+to+stop+culligan+water+softener+from+regenerating PDF link annotation
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/af9a9bdb87a027.pdfIn PDF document text
    • https://cdn.sqhk.co/xevoxotasopu/aJ2U2gj/19015126496.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/6t6hchi/summertime_saga_guide_fishing_rod.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/jjlCiea/train_timetable_sydney_to_perth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5feb1606c3d60.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/jcE8sgj/52929187248.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fcbf40b75714.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/dGM38if/tolivekad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fef122a608d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478402/normal_5fece670cd6db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601d4deb22f56.pdfIn PDF document text
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/7329855.pdfIn PDF document text
    • http://menudajuweka.22web.org/bengali_movie_panther.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_bdfbea97032143698cf9323e89b91e56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/903b2983-8c3a-42e4-993c-e7947fc01d16/how_much_does_a_full_time_starbucks_barista_make.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_a1e4c67993f840e2bebb2d8378f625d5.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_6062bcb83fbb40f2992c3c44972654c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c16750-b49b-4fcf-b9cc-a11ad4d097d2/xasezuvugejole.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_5218fefbcb7247a8885a8df9cd464097.pdf?index=trueIn PDF document text
    • http://sivigowukom.epizy.com/bolted_connections_nptel.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_3c919454480744ecbe882cb63f278a61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e988e1-5e07-4944-9a76-fc10e8d2d831/gokuwenubuwusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e947c6c-3be1-479e-9a32-45c5198836e4/kurevamitavusuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/966f2884-591d-4455-9523-9a86b14d58fb/is_krav_maga_legit_joe_rogan.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 5388 bytes
SHA-256: 5e0f0d8430e295b11b7c969add982a16e6a85691e6a8c72ff9455f3d17cc6dbb
font_01_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 10812 bytes
SHA-256: 603ab85d41aa090410bfc29b82a182c46ed889fb4b4f55b60d817cace961134b