Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9b9a540fd27fb1…

MALICIOUS

PDF

62.3 KB Created: 2020-10-12 15:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 808414e2ca8a6005e3e09d3481379c40 SHA-1: 714d1b40fc06d839ced884ccf03df375750a04f3 SHA-256: ef9b9a540fd27fb140eb1b400de59ff3e024e8b2fc63dea814bc65ba1bf2b5f1
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=prosocial+behaviour+questionnaire+pdf In PDF document text
    • http://misova.jmassageslc.com/uploads/1/3/1/4/131409098/fovixuniso.pdfIn PDF document text
    • http://vuwimelaj.jellybeanschilddevelopmentcenter.com/uploads/1/3/1/4/131437987/xuwutovadumuro-rofimuxewetu-bujotifatixi-dojedagoju.pdfIn PDF document text
    • https://site-1037086.mozfiles.com/files/1037086/36444323478.pdfIn PDF document text
    • https://site-1039658.mozfiles.com/files/1039658/kususovuwopijani.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/1/0433/0949/8536/files/doseginurolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/solution_of_concepts_of_modern_physics_by_arthur_beiser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9641/1812/files/pimejawujanij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4014/8118/files/next_level_basketball_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91338715-6f22-40f0-9746-df9ec5a3169a/pajevipexupuvetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5d8fd2-4d13-46be-8d84-70b16364d8c1/96527532607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb727d8-8037-48e8-b4ae-255129d2c967/monujufonefabunawu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5B0 4292 bytes
SHA-256: a47b68767a74cbec0e2bddffdd250d2ee1e40905b0f3c3034497317e32ae0b1c
font_01_sfnt_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 5572 bytes
SHA-256: 040d1be1c189b3891c885ba096a265d146957304abaa9ce7f869c5723cbae36c
font_02_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 10824 bytes
SHA-256: 7cd97f44b80957ab3c04b56e1e9c4185d25dfc8264d8feb7f0cdec25def40c91

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