Malicious PDF — malware analysis report

Static analysis result for SHA-256 4405b0a64c360b62…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 00:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 708c5ed4fe989c5abd2f04a86bcf673c SHA-1: beb0696b96e449b3ae2d34ec9feb9167ad372a5b SHA-256: 4405b0a64c360b62c2f9dfa6470c1a73b181038621d73ae3e9377ae75b1ea0e5
126 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 or SEO spam operation. The ML classifier strongly indicated maliciousness, and the embedded URLs point to suspicious domains. The document body, though heavily obfuscated, contains metadata related to PDF generation and keywords that align with the suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=hearing+visions+seeing+voices+pdf PDF link annotation
    • https://cdn.sqhk.co/nawakema/if4hfha/67524807469.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/0ogegej/monitoring_internet_speed_software.pdfIn PDF document text
    • https://tifozemeg.weebly.com/uploads/1/3/5/3/135325228/ginotidefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6038566e6bc02.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/dajitapanulaxa_povagojuxobaz_givajakuwuv_lemipezeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_604ae34e17e44.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/2jgOgdk/41679043066.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/Fjhgfjg/40020701427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fffbe0237db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_605ac5e05b087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485296/normal_5fe529ae0a67d.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/c7id0ia/rubberband_man_piano_midi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_60291ec5c2235.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/nelop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6028b85e5370a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/38369728185.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/73208469034.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_158797827aa84fa8af4b20475a42e209.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/aruze_corp_slot_machine_for_sale.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_5fa3d0909af14281889455953801c7fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/how_do_i_get_a_promo_code_for_tinder.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_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 5312 bytes
SHA-256: c6c70f079d49c26d5986c4d426a3ed971d0dee10a75bc90b787edfae9401c7bd
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 11544 bytes
SHA-256: 2836743045c9867012ac4ade2d5a8a747861c8e931c00ff470a2f9fd6c827133