Malicious PDF — malware analysis report

Static analysis result for SHA-256 233c01536f004782…

MALICIOUS

PDF

67.8 KB Created: 2020-11-25 17:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 55e66fdab2345265896f3a3095a3e5fb SHA-1: d0864cf18f7187e84b059adc851a050d8b22e43a SHA-256: 233c01536f004782cf47b92d232e32f3f10a46e5f401c0773239a2e88e2422be
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=social+media+statistics+middle+east+2019'. Additionally, ClamAV detected the file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', indicating a phishing or trojanized document. The presence of numerous embedded links suggests a link farm or redirection strategy to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=social+media+statistics+middle+east+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fb3488592ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fb8540848999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_5fa7a20a842dd.pdfIn PDF document text
    • https://gabozagabu.weebly.com/uploads/1/3/4/5/134506959/5a20821cd935a.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/9979988.pdfIn PDF document text
    • https://kegilosibumu.weebly.com/uploads/1/3/4/5/134513635/xenozomojizewen-guposage-revudoxin-buvimowogetiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5fb03d6937382.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/164082fef46.pdfIn PDF document text
    • https://zonebudufekepok.weebly.com/uploads/1/3/4/3/134382159/21e6a8f7b0cf.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/5811ab5bacb.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/jemazejodep/ap_physics_1_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/the_bronze_horseman_pushkin.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/business_analysis_approach_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/endocrine_hypertension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/our_lady_of_lourdes_daytona_beach.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/pinigiwuza.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_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 5576 bytes
SHA-256: 1901adb022d2c77e541a660b3e55720c0b494eb9305a75b33ec0c3633fceaaee
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10464 bytes
SHA-256: 0d64d42021c5d8cda5d4373a1ef58662e2b479f9dc9d3444cd4aba825341e3e7

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