Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49f367e37d357b7…

MALICIOUS

PDF

80.0 KB Created: 2021-01-04 11:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 32da5fab9bc56fc76f303d95d8da8e81 SHA-1: c2e327de1b1bc7e455c6a76a51e73ed8b60fe11d SHA-256: d49f367e37d357b7ce92a2668158c14102cfeb9d5a3adcd892f92d2eb0a0c3af
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and an embedded URL pointing to a suspicious domain, indicating a phishing lure. The 'SE_MFA_LURE' heuristic strongly suggests the intent is to harvest credentials by mimicking multi-factor authentication prompts. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://trafficel.ru/123?utm_term=aptoide+apk+for+iphone PDF link annotation
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/likenupojozo-lofosanaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_5fd9d8b2e94de.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/jcCjjB5/fupaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f8c2a7f22535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_5fb5bab4617ff.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/xikidajudinug.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
    • https://uploads.strikinglycdn.com/files/f1a44c26-94f0-47d0-b0c2-564c0df326af/80463472528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66c8f5e-cc7a-4f55-8ac7-fca69e0c630d/glasses_greys_anatomy_gay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4273ce57-ed42-42d8-b668-e4ca9534e408/factions_how_to_set_coleader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01876d5f-925e-460b-95e1-5e0aac43e8b6/bright_house_guide_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c70b596-31d7-411f-a375-ce25945d7a44/wedamales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74abedb5-69d7-4a0b-872c-828bf5b6d91d/42910028146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569bbdf8-6105-4011-bd0d-a0a39449826d/3565748905.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 4760 bytes
SHA-256: c7d703439b738768ab9b47e10c213529bc7f8a5430626a8c39b40d1609777051
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 14228 bytes
SHA-256: 8c61196f28abd33f7c7a92287518b83fa349e309e9a62f13f4da47ab627900ac
font_02_sfnt_off0001249c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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