Malicious PDF — malware analysis report

Static analysis result for SHA-256 072753a96fab2217…

MALICIOUS

PDF

75.2 KB Created: 2021-03-13 20:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aad303b8da8088c7ab31e283117ad6a1 SHA-1: 4eebdbad3a4511d49c34375605ce8feda5ded68b SHA-256: 072753a96fab22178a23900500079624d719da0094765d5801140488d60744d2
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The primary malicious URL identified is 'https://baarspo.ru/123?utm_term=formal+resignation+letter+template+pdf', suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://baarspo.ru/123?utm_term=formal+resignation+letter+template+pdf PDF link annotation
    • http://alex-chekalev.com/alarmy_not_working_android_10f00zt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_604cc33ac7a15.pdfIn PDF document text
    • http://vereffka.xyz/refifanusegunabojexipojivme3cg.pdfIn PDF document text
    • http://kyukty68.xyz/bivemisedm6f78.pdfIn PDF document text
    • http://hotita.space/the_lord_of_the_rings_4k_gift_set6w2u1.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/vivomalufakoporamutokufe.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/kosodim.pdfIn PDF document text
    • http://wivevadevenumet.mywebcommunity.org/hp_laserjet_cp1525_toner_cartridges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_6025c0ffacb14.pdfIn PDF document text
    • http://summ-green.fun/how_do_i_sync_my_panasonic_cordless_phoneic2c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6018b8b2c332a.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/ps4_skyrim_mod_load_order_2021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitigapevede.onlinewebshop.net/zulobofazer.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/easy_piano_pop_songs_sheet_music.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/how_to_get_a_replacement_state_of_california_benefits_identification_card.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/the_travels_of_ibn_battuta_quotes.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/wopujubitexukejal.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/free_crochet_pattern_for_granny_square_baby_blanket.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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 5316 bytes
SHA-256: 696f3c663891b948c28644a1ea3b43467f5c3645eb4e78fcac7a1445e41da4aa
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 10748 bytes
SHA-256: 48c83ebc46fba685845d9f47aef63ca84ad34ff3c8c41e649d273fbf9a1c6016