Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d43f0b27046fc3…

MALICIOUS

PDF

49.6 KB Created: 2020-11-07 16:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f48538ae00119d21c1c1c86d1501fd90 SHA-1: c78fe406e7c8893761ccedd3e614a1b9fe807a4e SHA-256: e4d43f0b27046fc3d78461f445b55d1838faef05aefc86f112b6dfd0fd78460f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, with one identified as a potential malicious URL. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/123?keyword=brainerd+high+schools PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d01b697-ae91-49ab-b846-59be3cccb677/east_clinton_local_schools_staff_resources.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5575c5e4-3429-42b5-a9c5-3fabb6b94391/25914349988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b245dc43-f975-42c1-b56a-4c6b19420618/89850018810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886d7b94-1830-4aa9-8175-2bf7e05ba70b/dagigigozuwoxabalizig.pdfIn PDF document text
    • https://puxefeko.files.wordpress.com/2020/11/advocacy_and_opposition_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bodepova/slideme_app_store_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ea57b9-1808-4633-9dd6-1e565947ee0c/88003213150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55bc5f67-c0f1-465c-89f8-4501b2766988/oxidation_and_reduction_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29305c31-edaf-4672-85d5-95d095be1d33/79738490474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cbf5698-9466-4054-9053-157998ecfd1b/74726807557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ee2ead-1364-4216-bd4d-666a3a8aff44/instalikes_apk_hack.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/fomevoxibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1417d1be-a5ff-4315-98a0-3935315add7f/sepakololupekikolabidovi.pdfIn PDF document text
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.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_off0000807b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x807B 5252 bytes
SHA-256: bfd5c6d5d1858acf52fbf56ce589f7a720bbe38ad704a5ca32c22341e60536d6
font_01_sfnt_off00009250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9250 11100 bytes
SHA-256: 70684a06e4286f01218d6a26a6b4cdcccbd4a7f9d95ade485e88bc71291294a1

Open this report in the interactive analyzer, or submit your own file for analysis.