Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef94aa960c929c59…

MALICIOUS

PDF

76.0 KB Created: 2021-01-06 03:38:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 83e9dd7eb13d5776e3095dd6b47318f3 SHA-1: 008a71df44a574e364533c0229f740814805f3dc SHA-256: ef94aa960c929c59966194edf6d55e4a60dcddd73aef52c22956edea192c166c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection strategy. One critical heuristic indicates a link to known malicious redirector infrastructure.

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
  • 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://traffine.ru/aws?utm_term=the+philosophy+of+the+industrialists+worksheet+answers In PDF document text
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/serometek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f913fe25e347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_5fee19cedd535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fe76cc40fd5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_5fb54d33b4ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fac22e211b7b.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/670813.pdfIn PDF document text
    • https://bazofaxeretaw.weebly.com/uploads/1/3/4/8/134868688/vukazekewomejodap.pdfIn PDF document text
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/perupogokef.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/8262382.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/edaea968-e51b-4e86-b7a9-37a9b8681472/8924885381.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/eritema_toxico_recien_nacido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a3f02f-6132-420b-9b9c-883532a38f39/69726216495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb0c3f8-78cf-4f85-a8ad-fcf3cc5a844b/amici_pizza_ii_new_port_richey_new_port_richey_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbafa9c-46d5-4a25-ae9c-083c475ac04c/code.org_unit_2_lesson_3_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba9dddae-e4ea-4c27-8f0c-347621945269/88989330373.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_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5336 bytes
SHA-256: 00dc272c8f267089dc800dc1f18e36bed8aad319b8d87241ce549b90dec26357
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10388 bytes
SHA-256: f13d621a66e0630717cd0e8c730cbe023fd8f76d9d35e404f8cc8bc50e251af3

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