Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8a128ec60be597…

MALICIOUS

PDF

84.5 KB Created: 2021-02-26 14:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ccdd7860dbb17eddf480a0a01902972e SHA-1: 53db79dc5fde24e3cf96aa37b38b792113d9abd4 SHA-256: 6a8a128ec60be597752af6e8da14583ba9a8457bcf856c6429f7a9f7dc303538
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co and weebly.com, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=directv+genie+remote+app PDF link annotation
    • https://cdn.sqhk.co/vudararemane/fmeYxjf/nolaxejikaku.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/8cb0779abe7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/b40gd0S/12898026362.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/Jgdjaif/hocus_pocus_halloween_costumes_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_600256db8542e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_6022d2ebba79d.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/Sji3Hgf/sawanuzufusokabanitis.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/novenomadirupav-kevulemi-gonamopan.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/4dd428da9.pdfIn PDF document text
    • https://kamutimasevukov.weebly.com/uploads/1/3/1/8/131856564/vivorereg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_60060f99e46a4.pdfIn PDF document text
    • http://babixuxuw.22web.org/86804425317.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/24954d955b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_60385bdfce914.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/xewusumake.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/pulavokaxe/annex_14_icao_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/actitud_positiva_en_el_trabajo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/chemistry_textbook_grade_12.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 5100 bytes
SHA-256: 52cc8aabf2d82f677d38210f18bbbcb30bc5777d3f69fbd67194f5066966523a
font_02_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 11004 bytes
SHA-256: 382bc9fef6f9ce3e560b1198bfe36928d83465b54e02e927100fd627624c2f8b
font_03_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f