Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ffd23e5b3f081c…

MALICIOUS

PDF

74.2 KB Created: 2020-12-25 10:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c507f5113aeaef24a35860bd4778a95f SHA-1: 111aa2d8c705e4c8ee7ae65a0d885a3af806ab18 SHA-256: e0ffd23e5b3f081cff61ad54a9a11c2160b3150d4ccfda48c45dc2b0273069ec
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting an SEO link farm. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to redirect users to phishing sites or download further malware.

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://gettraff.ru/123?utm_term=need+for+speed+most+wanted+apk+free+download+for+android+phone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_5fa582e769e3e.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/d2kd3ge/41743182925.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/3af7cd34b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f879f422d93d.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/fhiWRif/miwoguporosizukeliwebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5f9e8efd6174b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f974211c9553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5faa0cb05862a.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/bjiBgAp/what_does_your_story_on_facebook_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/OigggEQ/united_flights_to_miami_from_houston.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/ae9fae5d-3b7a-499a-8f9c-447db5eed71b/eve_null_sec_ratting_fit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bd1e03-c8fa-4f9b-8c99-a776166cae8a/86707131773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668ddabe-2125-4deb-825c-9571ed2215ab/tosesogamujanep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6998d349-68c0-4185-8bf2-18d3fd2e768b/bonkio_unblocked_76_google_sites.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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 5404 bytes
SHA-256: 130730d021c55c4bcfffa3ef0d7b10adf1438b53d3e73daef177dd62d6140a69
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10692 bytes
SHA-256: 5a137acec51669536e4b7d1be138f650658022371c31ae03cb66dd8c4f4169f2

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