Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4f05db17758b0c…

MALICIOUS

PDF

74.2 KB Created: 2021-06-01 02:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d9b0ce1d3125b08705980bccc6434f7 SHA-1: 76acfc9dcaadb3c1cddd1100223753cf533a7861 SHA-256: 9a4f05db17758b0c8bda14dc3613852d4cb926ae2f7cd2ce2f452d5d947f5f9b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one pointing to 'pistant.ru', suggesting a link farm or phishing lure. The PDF's structure and the presence of embedded URIs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/pbw?utm_term=trigonometry+worksheet+grade+11
    • https://cdn-cms.f-static.net/uploads/4410678/normal_604b38d967042.pdf
    • https://cdn-cms.f-static.net/uploads/4475875/normal_60502d51ab7bd.pdf
    • https://cdn-cms.f-static.net/uploads/4371536/normal_605d405aa139a.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_60526e0fa287c.pdf
    • https://cdn-cms.f-static.net/uploads/4491933/normal_60674c11abe8c.pdf
    • https://static.s123-cdn-static.com/uploads/4389576/normal_60053e5c3acd9.pdf
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fe743c4f38ff.pdf
    • https://cdn-cms.f-static.net/uploads/4421471/normal_601fe2ea42048.pdf
    • https://vejisiwitize.weebly.com/uploads/1/3/7/5/137515314/zivivadekutemubufu.pdf
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6054022a3eaec.pdf
    • https://cdn-cms.f-static.net/uploads/4476596/normal_603e277987f8d.pdf
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/fesuzagu-dekubunafarexed-wekapoxojafigup.pdf
    • https://static.s123-cdn-static-d.com/uploads/4403948/normal_60b560464889f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/b3dcc0ec-2158-43ea-915c-8280271f40dd/33910045304.pdf
    • https://uploads.strikinglycdn.com/files/0d66589c-1675-420a-aa49-0e25b148004a/how_to_describe_rhonchi_lung_sounds.pdf
    • https://uploads.strikinglycdn.com/files/78b6bbe6-789d-45d0-abe8-cfc90d68e54f/acurite_pro_weather_center_rain_gauge_not_working.pdf
    • https://uploads.strikinglycdn.com/files/d2e716fa-2e63-42ec-b4dd-c4b02b877ddb/32191392401.pdf
    • https://uploads.strikinglycdn.com/files/acf25bd8-3b65-4e7f-b68a-8b4e8717b401/listening_skills_quizlet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fb.bin
b25a49859180df2693bfec73e3110c99fd71e969e1d3ee09f254ae1129ec2669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FB 5464 bytes
font_01_sfnt_off0000e477.bin
7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 6068 bytes
font_02_sfnt_off0000f428.bin
2202a89b4e6cb0678f436ea36f9aedb9b78e4c26ef0f56e704efef9466952bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF428 11484 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.