Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae631641c237fadf…

MALICIOUS

PDF

43.6 KB Created: 2020-11-09 09:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 7b3e4d23f46d896c0761269ff4814d8a SHA-1: 508abf232f96cc6459c3cb8a05eabcc9318796f5 SHA-256: ae631641c237fadf27f140a710065b687932fb245191f01311f75327b79c9b20
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?keyword=powersource+1800+manual PDF link annotation
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/wogotos.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/7562549.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/898e8f82-0f90-47ab-b169-80cd318c3baf/felix_luna_breve_historia_de_los_argentinos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61985d7-02e4-4d73-9435-957d856fd2ce/2018_volvo_xc90_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa30bdc1-a536-45ac-bd66-bbd7b510a06e/vobutexitupexotefofupufal.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/allentown_school_district_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/soya_beans_farming_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c6a8dd-31ac-4132-a234-937854f30e73/levelejologufokelobaxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369e57cf-b925-4718-a099-dec93df28272/nonlinguistic_representation_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/66783889747.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/young_champions_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3af4768-5fbc-4fe2-9695-67ec88705068/97240818646.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/words_with_r_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358e3e31-51cd-4e08-a02e-b206cc2618ac/wag_dog_application_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/planbook.com_promotional_code.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_off000068d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D6 5428 bytes
SHA-256: 1c1615274db04019a3f6a3fdbb91af642289fe858fdd22a2484d5ef09fed2c6f
font_01_sfnt_off00007b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4A 10912 bytes
SHA-256: c7a87984af7382d244f357f013d53db36f39acb55c0ccf508949420c8ea972e8

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