Malicious PDF — malware analysis report

Static analysis result for SHA-256 381df5521d59b565…

MALICIOUS

PDF

85.1 KB Created: 2021-03-25 06:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf2a5c5318b61c5670d38c6288496b6a SHA-1: bbf9e6012014f67abd2d58873e82e69bb9f64aea SHA-256: 381df5521d59b565154f7ff6e011555853d3a2c668fa0fc26389fa53c21574a9
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded URLs and a heuristic firing for a 'download button' lure, suggesting an attempt to trick users into downloading content. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links, including one pointing to a known link farm, indicates a high likelihood of malicious intent, possibly to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=dragon+city+mod+apk+offline+free+download PDF link annotation
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/fimodesonirabar.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/5051b09b.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/jaxogomuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ffe61ce396e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_601b69b6076f6.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/2487594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_6000ff53a9adf.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/6381077a025a.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/xamorox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ffe031813b6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1217870d-bb00-4afc-9ec1-8ee113e0946f/the_bet_short_story_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906ed0c1-2704-4a15-af99-24d0971daa1d/7225187565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b77b2b-78e9-48b2-bf2b-0dc8976326a5/mini_14_10_round_magazine_california.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/gajal_gajal_odia_song_lyrics.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/synonyms_and_antonyms_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/how_to_connect_cell_phone_to_dish_hopper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82171d5-5f55-4270-ba76-db525facf8af/3150591640.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 5556 bytes
SHA-256: 4b8713c2752cfd7811465e339a583d29a5debc79cbbdd21b369abf65cfea6fe2
font_01_sfnt_off00011fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 11524 bytes
SHA-256: a92df8f79ea886452b361cae2efd7ae0f04e9969e58f6b7bf5cbaab5137abd8f

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