Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8ce7ee720d0cd3…

MALICIOUS

PDF

75.5 KB Created: 2021-05-30 22:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d584e4e771317f6c8993a4ea08931edc SHA-1: 3e72c5fa061741288ba40cb5d0c06c4223f27b4a SHA-256: ea8ce7ee720d0cd313a0d2777ce333b1bede91c0e30ea1e0eefe2b211b34170b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to leverage embedded URIs for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=air+conditioning+maintenance+checklist+forms+pdf PDF link annotation
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/4113519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_6010747794d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fdbc4f5dee08.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/vogutilize.pdfIn PDF document text
    • https://suzokapiwewop.weebly.com/uploads/1/3/4/3/134351383/824e6031f.pdfIn PDF document text
    • https://pinukozemaf.weebly.com/uploads/1/3/4/7/134713375/0b5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_603508a265798.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/500750.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/3962402.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/655a2092dd.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/pusupafavixomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369161/normal_6038c1ef86793.pdfIn PDF document text
    • https://mupamibamaximas.weebly.com/uploads/1/3/1/3/131379846/jejoxezulisukeviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_606c029182fe5.pdfIn PDF document text
    • https://ruxiwinovisas.weebly.com/uploads/1/3/5/3/135313790/foxivezafa-zuxelesi-suwivemi.pdfIn PDF document text
    • https://tasogedogag.weebly.com/uploads/1/3/4/6/134606554/gosijesimuvu.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/sejezokob.pdfIn PDF document text
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/7829422.pdfIn PDF document text
    • https://rawudirujitasep.weebly.com/uploads/1/3/4/5/134588445/6023787.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/d3afcb65-22e1-4967-a8a1-f64c37e52c8a/my_sharp_tv_power_light_keeps_blinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0911774-b5e7-496e-bea4-cda1d8f89594/lincoln_140_mig_welder_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18e637ff-a6e5-4bc6-9d27-bd2299bd4864/the_mysterious_benedict_society_and_the_perilous_journey_audiobook_free.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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 5624 bytes
SHA-256: 1f3374cd41b206b61eb34265b8f0fe777bed69c8a7e7c7c53cfa25ac632dd926
font_01_sfnt_off0000fc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 10428 bytes
SHA-256: 3b6047bf4ffd74f242094e7316a0693d8666a4858f511e5ababc41ecc717a7c2