Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cf43dd15ac6658…

MALICIOUS

PDF

36.2 KB Created: 2020-11-06 01:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 1d5660df2c3f3cdf6f43ea60d33f83d0 SHA-1: b1914daac8b77ab83789601bc3778fb3a1ea1c93 SHA-256: c1cf43dd15ac66584b413f0d9739725cd1d92aaf766f5c2ff5bcabfa9f3f77e7
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/aws?keyword=buffalo+ridge+elementary+staff PDF link annotation
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/pexutasa.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/7006100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f91ce7b19d3d.pdfIn PDF document text
    • https://nakoliveb.weebly.com/uploads/1/3/4/5/134503524/9545708.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/jolituzoji/mr_smith_goes_to_washington_question_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/54698455070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a590a215-b4ee-4866-a43a-ba3bf185a8fa/megoluwikatijaresamukiwur.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/10719021702.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/the_pit_and_the_pendulum_theme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4749/0981/files/download_stickman_legend_mod_apk_terbaru_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/84077673538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7436/8699/files/ap_bio_chapter_5_objectives_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9c6de9-5a51-4753-a0ca-c44f8265a221/ladatuvad.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/77290348448.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_off00004d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D7D 5376 bytes
SHA-256: 9f189cc32168fcaf2be5f370bab480bc294493fc3e3a29807b577d1e8251ea85
font_01_sfnt_off00005fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 10604 bytes
SHA-256: ff2cca8571cacd70f59d82a822f833d14ef7d8be8413af69e98c0127627772f1