Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ca1bde954b7177…

MALICIOUS

PDF

85.9 KB Created: 2021-05-14 06:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c7eaf8edd8ca7847e0b9d4d643004ea7 SHA-1: 183189453f1182e62d1138ed9364b786209b4032 SHA-256: 11ca1bde954b7177c9170f7f2b1006bd7da0f1060395e207001306a1df5e1288
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 hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=hp+10bii+financial+calculator+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/muzipajat/rijgcyc/fowuvovugululoloxerugazi.pdfIn PDF document text
    • http://sefexetewizu.iblogger.org/infernal_cape_pure_guide.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/9561925.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/8Zieiit/83163833822.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jjihbTX/badlands_bbq_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jigekuragige/PVUKiiA/class_9th_cbse_social_science_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6068bb6f818b7.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/nevimume.pdfIn PDF document text
    • https://cdn.sqhk.co/gidetixi/QTjhjgq/6395640539.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/kabosos.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/PLicKij/simple_healthy_gingerbread_cookies.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/sumidobedumewujebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_601db41b1f23e.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/CjjeVxi/twisted_wonderland_english_release.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
    • http://bukijujer.rf.gd/kawasaki_prairie_400_oil_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89fe67da-858b-4658-9657-af6031e7e181/what_is_ie_error_on_lg_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea94817-68aa-48b0-bed7-7488c765f589/what_alice_forgot_movie_release.pdfIn PDF document text
    • http://xidatozekef.epizy.com/68144833020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9758f3-eeec-4c69-b1c7-8b71bd260cf3/62183337319.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 5548 bytes
SHA-256: 1afa3224a277ea17ba8c1127f5ecb81bea8d755b2309f48517af4c420e298418
font_01_sfnt_off0001130a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130A 11672 bytes
SHA-256: 46cf105422e920936b0c721d85fc1b3af27d5c22036ccb04b3408d862b07d326
font_02_sfnt_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2