Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37fac32dd8261e1…

MALICIOUS

PDF

51.9 KB Created: 2020-10-15 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 94ea0e9e2fe8744c8dc46b2699c667a0 SHA-1: 2c39fc585da3e11e1c619b7b5daaf8cdbf1559f1 SHA-256: f37fac32dd8261e1fcfadc92c15ab76d4f34c1ff96f7addc486dac37c62e2423
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://ggtraff.ru/123?keyword=anemia+ferropenica+que+es+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f87cfaf1f9b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86f5c8d71d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f87c6b1b84f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f870264cd2ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8716d9737ce.pdfIn PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/lotoxogu-gumobilisim-nexel.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/376970be9f6b4.pdfIn PDF document text
    • https://site-1043843.mozfiles.com/files/1043843/sibekuzajukaforatupi.pdfIn PDF document text
    • https://site-1040984.mozfiles.com/files/1040984/xonusulezo.pdfIn PDF document text
    • https://site-1038924.mozfiles.com/files/1038924/xomosonakudi.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/1/0466/3587/6517/files/fruits_basket_ritsu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/metodos_de_muestreo_aleatorio_simple.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3210/5119/files/25383881440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/3685/2391/files/3.6_as_a_fraction_and_percent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/zevubazupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/44515590706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9851/6893/files/57127592103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a526371-08c8-4bac-9018-3cc8b636bef2/77266407702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9826ee7-a1a5-4eea-86b8-97dbdab3d4c1/96298188258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9207f0e4-43e2-47b7-87b8-85b143290e59/vosevofovatubuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33db99d6-d1c1-4a7e-9215-11f27fa10fb6/vagonuvejanavomigobif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16be10d-fc63-4795-882d-e998b8802ac2/41738711384.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_off00008d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D02 5384 bytes
SHA-256: 9461956f04d532d57caeaa15511ff1c180d26ee43449c8549f3cc58f7fab4a2e
font_01_sfnt_off00009f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2F 10424 bytes
SHA-256: 9ee98063f1cedd8e84fcf7e8e7f58b6315b9c8c3d6f4f3e9a4279a62a930d7e1