Malicious PDF — malware analysis report

Static analysis result for SHA-256 6668094cfd367123…

MALICIOUS

PDF

77.1 KB Created: 2021-03-06 20:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e0af2baf9ee339a8be21088b3a1b2d7 SHA-1: 728ecc743cbb03bc0d1e9da5150182c3c964cf3f SHA-256: 6668094cfd36712321e98c2867354ab6614915d2f57199a810a76e4941bde205
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting critical heuristic firings for malicious redirector links and a link farm. The document contains numerous embedded URLs pointing to various domains, suggesting an attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=easiest+hindi+songs+to+play+on+guitar In PDF document text
    • http://studytogether.fun/napusigosujavokqew0.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/b0acda1c76e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_5fe76add1d836.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_602714e7e9652.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/welomefogidojawoze.pdfIn PDF document text
    • http://vwwv-avito.online/bhojpuri_movie_raja_babu_mp4ke15j.pdfIn PDF document text
    • http://leree6.club/are_alternate_exterior_angles_on_parallel_lines_ever_supplementaryugn4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_603b84103a0df.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/why_is_my_samsung_refrigerator_not_freezing.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/8367250.pdfIn PDF document text
    • http://sodahub.pro/angels_and_demons_book_vs_moviernoo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5fdf74e922b76.pdfIn PDF document text
    • http://adanakebap.org/224445469qx1cs.pdfIn PDF document text
    • http://vutisonoj.sportsontheweb.net/45186260102.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/267a5f0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60365bf9be22e.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/2696165.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_085301a6993147789113738835c53d7e.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_de64ce9fef7441a9adcbe3c48d9172c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/balochi_funny_cartoon_3gp_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/tejurarilabigi.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/46143710289.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/what_are_the_10_stupidest_baby_names.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/how_to_read_schematics_electrical.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_a560868f84d2466ea4943dfbe7d29974.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5164 bytes
SHA-256: d80fc8e7e3e1f2e7807fe2b720fb7d89a261f1fee4315cef16e526c33b128be1
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 9932 bytes
SHA-256: 52c8a6cd83f64675f83b5b3360ba54ba9eab89ecdc701e4ce9d08f13a3bebc17
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3