Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcce640b7d48638c…

MALICIOUS

PDF

105.3 KB Created: 2021-05-30 05:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a720336544d1e25efe87563c987792a8 SHA-1: da757f749b2c22118b7d272d56435a1ade6c90e5 SHA-256: bcce640b7d48638cf203f9e0436b8c84c399a3aa09d9fa7e8955bbcf10e10531
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The primary URL, 'https://fokemale.ru/strik?utm_term=how+to+install+zmodo+cameras', is presented as a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=how+to+install+zmodo+cameras PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422368/normal_604cf06a2710b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_60354b1c10704.pdfIn PDF document text
    • https://nefositasin.weebly.com/uploads/1/3/4/3/134310380/xixakepixi_famep_digefasomuxu.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/dejixi-supewip-zixinawoj-fefurowenifa.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/wujemal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fe519881a2f8.pdfIn PDF document text
    • https://befofevaz.weebly.com/uploads/1/3/0/9/130969220/zagari.pdfIn PDF document text
    • https://lorudopop.weebly.com/uploads/1/3/4/3/134315835/zetov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_604f21d3035df.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/tuzakoveto_tabibasiju_kubuzutixi_nevimoxivama.pdfIn PDF document text
    • https://sibujoxosuzeru.weebly.com/uploads/1/3/4/4/134499285/3705697.pdfIn PDF document text
    • https://beretukajawedu.weebly.com/uploads/1/3/4/7/134713042/717737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_606978d296e25.pdfIn PDF document text
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/dabemogoro-jadorop-womawurux.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/nibapodivemibit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5fedaeb041740.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/4484322.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/bcb079b4-8e95-4d04-805f-d04dd238edd0/how_do_i_qualify_for_a_covid_19_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d76f6d3-8039-4379-910e-99d7996bb560/how_to_get_a_bugatti_veyron_in_gta_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7fdc30-933a-4a48-8d06-1d575fb380a3/avengers_endgame_game_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b1a1a6-08c4-4850-8a46-28635a86f67d/xupigej.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_off00015dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC9 5188 bytes
SHA-256: c8ce1d92b74df105f34605c3224bf1b161c27032b31707ba199aee0d7b95a52c
font_01_sfnt_off00016f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F67 11880 bytes
SHA-256: 3f5af16bf88c6d29c0706dba215bdd9542a916cf5a188651c6632fd8a042ea70