Malicious PDF — malware analysis report

Static analysis result for SHA-256 66abf01d3511e501…

MALICIOUS

PDF

70.4 KB Created: 2021-05-21 10:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a83a6e66924df9d342be14e80c5a968 SHA-1: 16adcf023525bbd0285e111280bd57360977bc2b SHA-256: 66abf01d3511e50156fe368e3cd9a30b4bf5041ef620b87123fdf85f5eb2cdcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are embedded within a structure suggestive of a link farm designed to manipulate search engine results. The primary URL, 'https://jottigo.ru/strik?utm_term=shelby+county+in+jail+inmate+list', combined with the document's metadata indicating it was generated by wkhtmltopdf, suggests a phishing or malware distribution attempt disguised as a jail inmate list. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jottigo.ru/strik?utm_term=shelby+county+in+jail+inmate+list
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/kedulomalepeme_jikujarorikufis_nawixubukak_zapogomalogopev.pdf
    • https://cdn-cms.f-static.net/uploads/4478950/normal_60469457c8923.pdf
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/3584131.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_606623e87248c.pdf
    • https://silujufadusume.weebly.com/uploads/1/3/1/1/131164496/2530592.pdf
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/5b43bbbe3a.pdf
    • https://vatifogogunubit.weebly.com/uploads/1/3/4/7/134725392/lozukitago_masekaxemivaj_dunirosuneni_pixopobefofef.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/gajev-pijeguv-kexavovubuwosu.pdf
    • https://xulobefopit.weebly.com/uploads/1/3/4/3/134349373/zozite.pdf
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6038d50524cde.pdf
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/8822537.pdf
    • https://megojame.weebly.com/uploads/1/3/5/9/135992505/7392d18a80a91e6.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/a0d6067e00.pdf
    • https://sojutobifedurex.weebly.com/uploads/1/3/4/5/134588439/69590294b210b2.pdf
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/5898561.pdf
    • https://derixajulinam.weebly.com/uploads/1/3/4/3/134356287/8d68ff20a42b8.pdf
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/b1d4afb.pdf
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/b662529989f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8b421755-1577-4ea1-98d0-f26ffcdb9c3c/brand_image_meaning_and_example.pdf
    • https://uploads.strikinglycdn.com/files/97a35eb7-c9ba-409c-b221-2d6ff1eefec6/cuales_son_los_tipos_de_descripcion_existen.pdf
    • https://uploads.strikinglycdn.com/files/ada8040d-db2a-430e-bad2-9b4e81f92599/23245258836.pdf
    • https://uploads.strikinglycdn.com/files/6cc19cf9-8b82-49bc-9717-41e0b587008c/bissell_proheat_2x_pet_lift-off_upright_and_portable_carpet_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/9c7cfd95-ea56-45d0-bd49-66aa565bd3d0/1861092192.pdf
    • https://uploads.strikinglycdn.com/files/2053ead2-6eef-4d7a-9288-934ea5cb3262/63876477224.pdf
    • https://uploads.strikinglycdn.com/files/b9beee25-c456-4c65-ac00-39d8acd7a44e/is_20000_mah_power_bank_good.pdf
    • https://uploads.strikinglycdn.com/files/0300671b-6a17-4ed9-9214-de5cd95991a3/junarajakiba.pdf
    • https://uploads.strikinglycdn.com/files/eecb4353-fae6-467f-8c7c-0533e8d02fe0/69054840037.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d793.bin
cd8915a96a35792d4b24bc87cec1123b7f42e9faedf8b5d4a9be47f8b61178c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 5364 bytes
font_01_sfnt_off0000e9bb.bin
41445550729cebe7318b7adc5b6e9f280fa95c096bfd7d5d4b4d8ea02a8218d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 9948 bytes

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