Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe863131a4f0105b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-23 12:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f024d0731486cd1680e696e5d428e074 SHA-1: 4e81ffe5f1c55f626cac48c83a97ee4ec3b0efb5 SHA-256: fe863131a4f0105b15973ba4eb23a9c3407c46d0cfb94ee05e76cc652a04c064
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, appears to be a lure related to search queries. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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://vilenefex.ru/strik?utm_term=how+to+listen+to+music+while+running+iphone PDF link annotation
    • https://cdn.sqhk.co/tezizejaropu/dftrCSO/zadafafitivavajeze.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/ZwHPMjh/19087319637.pdfIn PDF document text
    • https://cdn.sqhk.co/fejezolixo/jX0lqqJ/3148866498.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/hishaje/25352935256.pdfIn PDF document text
    • https://ropadapolope.weebly.com/uploads/1/3/0/9/130969983/09835.pdfIn PDF document text
    • https://cdn.sqhk.co/kebokeregim/ijgGB7d/gijijazipulatikonipixo.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/sidiwafukuxubof.pdfIn PDF document text
    • https://zavinuso.weebly.com/uploads/1/3/4/4/134461772/8008379.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/sagexovig-vowomaxodexak.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/fqcfgco/45442537109.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/Nwzvigq/download_car_mechanic_simulator_2016_mod_apk_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff687808ca48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_600be4f4c1d8e.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/aJji2ja/61231079487.pdfIn PDF document text
    • https://ponatuxo.weebly.com/uploads/1/3/4/5/134596183/wazifexopafugem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_d2ce5af782184c00853b833026e2b0b2.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_53f0ca87f31549668122954786d62069.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4db8cb5-36da-4a39-82b5-4b1fd1c5f513/53344629071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc34290-a103-48d6-8b0e-cf27aadbccf6/zuwelitezezejuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19db14f8-4db7-4979-9761-316f3be6fd2e/watch_fifty_shades_of_grey_full_movie_download_filmywap.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_92edad901caf4e08b956172de13bef02.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_10029eb54874487385f9dde884cef091.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc471f3-8f95-4d2d-b5a8-a40c5a3b8da2/does_dish_voice_remote_work_with_wireless_joey.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_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 5188 bytes
SHA-256: 4a9baae3317d32511a25fe72fb298c7bd5c771e2eb26dcf89f1f2c7e4a7ee04c
font_01_sfnt_off00011314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 11144 bytes
SHA-256: 81f3d494985755be8eec6c52827ae86f0a588157338d0e3aab6b35c6ed050490