Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdf768064b06209…

MALICIOUS

PDF

78.7 KB Created: 2021-05-08 09:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6cfab671cd51a2491415753c7e1d536 SHA-1: a38d581c0b46170de403281de0a53b97bc4f84af SHA-256: 7cdf768064b062096f8aaad5a6e6f74091d1881b893f4d9a832ca400a0c41859
206 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve as a distribution point for further malware. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://druttle.ru/strik?utm_term=how+much+weight+do+you+lose+eating+1200+calories+a+day PDF link annotation
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/b947cb5.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/muwefoka-nivajovoroboge.pdfIn PDF document text
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/3f45662708ce61b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5fe5bc1e1579c.pdfIn PDF document text
    • https://cdn.sqhk.co/vatepasoxi/iNMjV2U/mivowumeti.pdfIn PDF document text
    • https://dakewamegiru.weebly.com/uploads/1/3/5/3/135305658/duvuzad.pdfIn PDF document text
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/belugofanevadasid.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/ahf6haV/sakemanumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_604181a4c2e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fdb1247791f7.pdfIn PDF document text
    • https://momigetufi.weebly.com/uploads/1/3/4/8/134876151/sozitijusamo.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/iiKgchd/asphalt_street_storm_racing_full_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_60175f3f6f437.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/507cbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496146/normal_604edc0fa4d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd31d69266ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_602de06ba0f46.pdfIn PDF document text
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/zuxitobube.pdfIn PDF document text
    • https://gemikomumupoj.weebly.com/uploads/1/3/4/3/134393585/026489.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/jgKhfge/qr_code_barcode_scanner_pro_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5ff2771667d14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murobalebijuge.rf.gd/13078716989.pdfIn PDF document text
    • http://satonavuka.rf.gd/alcatel_one_touch_software_free.pdfIn PDF document text
    • http://lagokatu.epizy.com/78616584804.pdfIn PDF document text
    • http://koxowasone.epizy.com/sword_art_online_integral_factor_item_guide.pdfIn PDF document text
    • http://zitovidenelanus.rf.gd/acute_coronary_syndrome_review.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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 5836 bytes
SHA-256: 0fb4dc64e75398792d1b12be02bc89f5514a5aec0c99a903ccd2c6b9ca28329f
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 10608 bytes
SHA-256: 239ef70c2bcebb110b2ff94e8fa60766d33650a34579bd0acfe655d1189acf41