Malicious PDF — malware analysis report

Static analysis result for SHA-256 5442d46348e66b69…

MALICIOUS

PDF

54.6 KB Created: 2020-11-09 13:37:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: f31d9a57745bba90424a4f7a21876b00 SHA-1: a10d4340c72a9293bb0684122e39ff28aacf0055 SHA-256: 5442d46348e66b69c30461ee4f324e2cbbcab0470d1e561307952b74ad6dc28f
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=espn+top+100+women+s+basketball+recruits+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f87ae0bbb0e3.pdfIn PDF document text
    • https://japiloxekafu.weebly.com/uploads/1/3/4/4/134480389/22325db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f873136acca0.pdfIn PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/6169007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cc68103f-66bf-45e2-a925-3e2f667d404c/90379176904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e6d7fa-d725-4119-8912-f038e56ed9f0/bisiluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71bc6e2-c2b8-4eca-a37a-eac7f492e29a/90303680383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ca0f783-be1a-4f28-8621-dc59399a8bd7/zefukakebubobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f620e6f7-0876-48b9-87c0-0b206387b1b1/rogamegeserori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e6354c-a3e5-45f2-9ce3-ee7de7e292d4/algebra_1b_final_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ad0771-9c55-4d7c-b803-268cc785561e/dan_and_shay_speechless_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663dbcfb-dc74-49f6-b0d9-b54120fe612c/nipifadaxefijiradupokut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8986 5540 bytes
SHA-256: 985d0ae56927f2eb285d8acdad149cfe38ff76adccd0fc5700822408aa293da1
font_01_sfnt_off00009c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C52 10084 bytes
SHA-256: 4331d79581b70838aad28f9419b8d4a20deb2eb672413bf7f79c5333cbc3b547
font_02_sfnt_off0000bee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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