Malicious PDF — malware analysis report

Static analysis result for SHA-256 53943fcff7a7ddba…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 15:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 637efa0776f5ed4fe0517736e1ec4494 SHA-1: 16bf1c4f8f12cb49e73c977dd00c03b51d5f510d SHA-256: 53943fcff7a7ddbaeffc07c4141723888430edc60f7a61fbab8aab9a7968932a
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://traffset.ru/123?keyword=lightroom+cracked+apk PDF link annotation
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/supuvevajezelomitato.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/4ee39e342f41.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/7c433054.pdfIn PDF document text
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/d0e73e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/nuwelurinemu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/quadratic_inequalities_test.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/kevip.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/come_as_you_are_big_bass_tabs.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/bise_fsd_9th_result_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc58c1b-2b25-4698-9fa2-ccc3e7e668b4/tigebulazilewilut.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/kejow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba0a311-ae18-42cf-99e7-b9407f165c1f/suzajoruzudixukuxerupom.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/palmistry_marriage_lines.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/graphic_organizer_for_opinion_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3627240f-46cf-4f07-a378-5a176ec0bd1a/kogukodisudupejigedepi.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_off0000645c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 5280 bytes
SHA-256: 371c04a02d58b1b3a78b1a3ca508acae094653179a592c486ce59c1c5dce4d50
font_01_sfnt_off0000762e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10752 bytes
SHA-256: 849743d14f769c37aa3e3387e084f41f5ec8220e0de3e0102f94a819f0707c09