Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab75660f557c6767…

MALICIOUS

PDF

40.2 KB Created: 2020-11-08 23:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 5613fc2184317fa42ad19cd474236878 SHA-1: 2abcf978b4a54ead9d52cb2884f79cacc660212a SHA-256: ab75660f557c6767f96a8f3f37a3191b80023979f7f9b0042c0ddde161cbf141
156 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=crow+wing+county+in+custody+jail+inmate+list PDF link annotation
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/kabunadikuluba.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/desenaz/20682444685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a98858-889e-4c16-bc7d-a8cfc13af73c/dekeza.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/55114501063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e666301c-e206-470b-b09f-26ca42b8e276/rovotiliwamogut.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/welubajoxegusikakipuke.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/85281883140.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/gidesituduzafuxesuri.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/truth_table_generator_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/meralgia_paresthetica_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/22710409017.pdfIn PDF document text
    • https://zejifumeg.files.wordpress.com/2020/11/xilazon.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_off00005e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E02 5436 bytes
SHA-256: a874295410374022c05972222e2697b1953627d3fbd7c9ef6fab21690c34de99
font_01_sfnt_off00007084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7084 10396 bytes
SHA-256: 8d2d173456eb460b7b7a0847afc60cff801652758e90c7f73be15efe655d9b98

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