Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf63e9f90be6743…

MALICIOUS

PDF

94.7 KB Created: 2021-05-13 14:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: afd6434769542b9d1e4e25497cc4e04f SHA-1: fdbe4bfac9980b62d4c4e2ed1f7cdb2bf6e35385 SHA-256: 1cf63e9f90be6743b66c6128ad6bc4d4d6675dc8238a8036b0ac75ce96b9074f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, many of which are associated with disposable hosting or unknown reputations. The primary function appears to be directing users to a large number of other PDF documents, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/strik?utm_term=sony+str+dh810+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/serodozire/J74jhih/luligobukikixo.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/lelaje_fedisi.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/eCM07gh/muresikolikomixalabajof.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/magodufusaxumet-zowagezitil.pdfIn PDF document text
    • https://sukizasatesez.weebly.com/uploads/1/3/4/6/134686833/ketufe_papazusasezowu_gabedegogak.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/9660463.pdfIn PDF document text
    • https://rumarefux.weebly.com/uploads/1/3/1/0/131070750/wezovejeti_muwovelazaxodur_wegujazugore.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/jPgcjbb/card_scanner_app_ios.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/gupop-zazabilemax.pdfIn PDF document text
    • https://lovukuterun.weebly.com/uploads/1/3/4/0/134019750/derarudolebesuv.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hdDtjcC/68305167691.pdfIn PDF document text
    • http://korecos.ru/80334994328caoup.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/0df4b.pdfIn PDF document text
    • http://kyrgyztours.com/employers_workers_compensation_classification_guidelnx9q.pdfIn PDF document text
    • http://opensalon.xyz/furesx8qic.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/HpjiVhf/xufepubobadaros.pdfIn PDF document text
    • https://xovadodelemowuz.weebly.com/uploads/1/3/1/3/131383330/mosal-masutifiwave-besajikopu.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/f82d7e20-6248-43b1-9a99-7618eac19f8d/what_is_the_difference_between_snmpv1_v2_and_v3.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_f0be27fb8ff5464bb9d5542b1bc5f22a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cf899b-5593-484a-94d0-a15db037e27c/30006747978.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0fd71ee4ff654ae2a37f57daa7423b06.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_20ade3a83c014026af3f8b4dfe9d9542.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2949a3a9-dab9-449a-8633-ea2a1d860e57/29469327532.pdfIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_43a8069923de481fa01ae42958d8f445.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_cd724097ec0a405c964deb1c8ca15591.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3288e033-b3a1-4621-ab2b-0cb2d08abce7/gezesoxujatekarukifub.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_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 5872 bytes
SHA-256: 745603f165ae7c3ac56c60dfbb699d170e5330623dcbac0638a03f4d9249ec85
font_01_sfnt_off0001464a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464A 11388 bytes
SHA-256: 34dc6d13d15b2aad771824890a96883ce87ec22908569dcf89797eeb612c1c74

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