Malicious PDF — malware analysis report

Static analysis result for SHA-256 52982d0f02f85b12…

MALICIOUS

PDF

70.3 KB Created: 2020-12-21 22:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9997b9c7cec80181a679ae76bddd8a2d SHA-1: c3974fd88e265982952ec19ac9dccde921a6ee6e SHA-256: 52982d0f02f85b12b6839f3528c5d690bd0edc7a150999ba6c5cd39b4e60a848
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a machine learning classifier indicating maliciousness. The presence of external URIs and a large number of embedded links suggests an attempt to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the nature of the link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/strik?utm_term=pentagon+naughty+boy+lyrics+translation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463010/normal_5fa47fa8f336e.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/0accfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_5fa4b046e22fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5fc0f45aee9f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f86f9cb3e6a0.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/d84fa098-81ea-43ae-bf8c-2fc6ccedd110/spanish_to_english_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/68788527749.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/indian_accounting_standard_27.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80ad5b4-73ad-41b6-938a-07379ce6ec32/we_didnt_playtest_this_at_all_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/27543892532.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/grade_25_concrete_mix_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498b0f1d-a6d6-4673-9483-d4d0331103db/boguponodewagozem.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 3704 bytes
SHA-256: 0951e727ae4a0336e7d35c487aec4a34562c31a55da5fe42f89f466575b2eb85
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5304 bytes
SHA-256: 143e83aa9fabed89d14d0e2965b9bf27e017208d328c00d010eeea7bc84ed51c
font_02_sfnt_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 10092 bytes
SHA-256: ce310ffd1fe20bfcef42e36faddeeaff07e8db92f4a5a1a0bef4ebb1eeca56f8

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