Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d5d3c4b110d6ff…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 01:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b603b1d41e104a447109cc5a2f8aed0d SHA-1: 5b561367f329d25029a0001d6f870488eac58a74 SHA-256: b4d5d3c4b110d6fffcd060bffba32d9743702a5d3b6171b0b524b325c3cef800
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of multiple external links on disposable hosting services reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=titleist+910+d2 PDF link annotation
    • https://lufosafol.weebly.com/uploads/1/3/0/7/130775677/5b58e25cd5e753b.pdfIn PDF document text
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/175687.pdfIn PDF document text
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/bbd1493f8851c.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/ede075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_85554432d109401d9989c53f30c6a847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5346d985-4b6f-4604-a3fc-2f34d51f02c5/lifekomelete.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_72c27dbfef7c416cb611c1862f111086.pdf?index=trueIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_32a54db09b5948e4be0ab3f833d04ef9.pdf?index=trueIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_6b3c7270d6e149ba9bd518d6684cae88.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_1d982cab63b44e79876e3934e18c1396.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_321492bcc0c24b89824ba2b75008b48d.pdf?index=trueIn PDF document text
    • http://lapodalojowev.rf.gd/activate_b2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1aedd47-51a8-4aeb-bac0-9e5832f50e3a/which_came_first_the_bible_or_astrology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18290337-f382-40ab-b149-595310eb5405/zenisefukosimef.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_3147d8a3e5184cb4b552f23dca99a2a5.pdf?index=trueIn PDF document text
    • http://maludoxowo.rf.gd/topology_in_gis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e2bbd0-e717-42a0-bbe4-1456ad78188e/fisher_and_paykel_fridge_rf610adusx5_manual.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_4e47036003e743cdbf687e67e58d793e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b2ac0b-5435-40c4-bead-cc37a5644bed/how_to_get_rid_of_ac_joint_pain.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_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 4944 bytes
SHA-256: 918e772e455485b73db1ab4a8aa510e84f1a690d489da32aa65294f5d01726d4
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 11516 bytes
SHA-256: 267aa2358359886aec20ad3c74ce8874447c5d4e2870d398cbaca2411136df42