Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eb22377c8d624e…

MALICIOUS

PDF

77.0 KB Created: 2021-05-28 12:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e52a17b9809d6410ad6db1c2b6f87187 SHA-1: 0a60cf754cbd30651ad5116a61360d846c6ea818 SHA-256: b8eb22377c8d624e47ba317a7afb9b9483a563f9125713bfaf6cd9cc972ebddf
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with several pointing to unknown or potentially malicious domains, suggesting it's part of a link farm. The presence of these links and the overall structure point towards a phishing or SEO manipulation tactic, potentially leading to further exploitation.

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://golowaki.ru/wb?keyword=medical%20coding%20books%20for%202020 PDF link annotation
    • https://tenekivosorudo.weebly.com/uploads/1/3/4/5/134596066/xaxara_nelutusogaselu_xutunipadibonik_xefakovuvew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_6067cf4ec0970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fef43eea7c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_600f2cb52a4d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_6007f2a3dc975.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/25850.pdfIn PDF document text
    • https://vitumiwoz.weebly.com/uploads/1/3/4/6/134697216/4a20c6a71dc71b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_5ff5d093be7c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_603fb259544bf.pdfIn PDF document text
    • https://tomovomat.weebly.com/uploads/1/3/4/6/134617768/xanulugi-wafozisenu-gugonebiwopageg.pdfIn PDF document text
    • https://kaxunuruji.weebly.com/uploads/1/3/4/7/134725802/vokotigipa-vuxeduziwusiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_606ae4971a9b3.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/gapawekoto-lulevozowem-jetetagixalifev-tumosile.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/jutadizuwejiberipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_605225090096e.pdfIn PDF document text
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/9d301307adee.pdfIn PDF document text
    • https://sesejeku.weebly.com/uploads/1/3/4/4/134495796/kogovivitetonit_betomavalajiwoz.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/duxemufugez.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/66fe705a-315f-4c8a-8a73-fbf4b5800860/snapper_ninja_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b4add1-4e76-447d-9881-951ace32b591/39884957538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416055fe-c6c5-40d0-9ee8-412d8290612c/what_is_the_price_of_95_unleaded_petrol_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/445a06fc-a0b7-4cd4-aa1f-2d3bf995bca5/36462011856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a827b3fe-85cc-4a71-8550-d332a628e54c/how_to_determine_jump_discontinuity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f091500-aa03-4b37-8de3-dc86366852fb/pe.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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 5672 bytes
SHA-256: 03931fe182b4510b084b60f924b00cc7b02797e61a1e43fb941bf314e7fa669a
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 12128 bytes
SHA-256: ec5a90e24f10fa06f29c1e177427a37cb36db4e45f9384a6b0cb3b9936fe9b60

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