Malicious PDF — malware analysis report

Static analysis result for SHA-256 256379a21fb1a277…

MALICIOUS

PDF

44.1 KB Created: 2020-10-28 11:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: c882fb3d34b93f501f920bb01fe401c6 SHA-1: 96e1b0834e7206359a7981745acb4dcbe0193368 SHA-256: 256379a21fb1a277918db0188c72c98aea00cce4105a125713d82294c5e6c943
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=4+to+the+5th+power In PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/jijofemesu.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/totenowawuni.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/2207905.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/dbf85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7751/5941/files/20395026551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/wood_slab_coffee_table_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2012/5079/files/dereraxen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/7957/4180/files/judesomopazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8963/4483/files/supervised_vs_unsupervised_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7f9763-a774-47ca-b392-ad9ca644292f/costco_pre_cooked_ribs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8170/3319/files/the_teachings_of_buddha_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3210/7937/files/36649049958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c68a793-8576-49ec-8680-1f25c6e91d78/puvepoputogeta.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/guide_me_o_thou_great_jehovah_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/riddle_transfer_1_walkthrough.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5148/7910/files/96379660647.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/lefuxorezolulikob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31922782-af1b-4336-ac8c-7a3ffa54fb5b/wagapunafide.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/lipebibuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/family_worksheet_year_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9062/5191/files/suzidinosuripinixil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7795/2186/files/40430683664.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_off00006c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C20 4696 bytes
SHA-256: 48fb517aa63877821c4c97be7b52816c165fc521e9eb2b5f849b0f1adce44df5
font_01_sfnt_off00007c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2C 11824 bytes
SHA-256: b977d2434de15ff4d5e5d24d69b64f21e10a26c4d90df4413cd50a075054f538