Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fcf68e6eec280c…

MALICIOUS

PDF

73.7 KB Created: 2021-03-14 02:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 27e0eb19df644563580de8e93cb3b4d5 SHA-1: cb121aa67fc8349fec680dcc790cd3d11804edaa SHA-256: 12fcf68e6eec280cb9973ec6c25f611870ad18552754d8589943389b3b5c728d
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a phishing or malicious document, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK. The primary URL, 'https://vilenefex.ru/wix?keyword=minecraft+2.0+apksum', appears to be an SEO redirector designed to lure users with keywords like 'minecraft 2.0 apksum'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=minecraft+2.0+apksum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413848/normal_603f4a6c3330b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fd7646374800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_602028091002c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ff06e44dc0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_6038c388e3147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_6011eec37ab56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485696/normal_5ff54f3819699.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/vocational_education_in_ghana.pdfIn PDF document text
    • http://nedavupagisezim.mygamesonline.org/51924220923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pisik/auto_increment_number_excel_sheet.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_e748512faaae48c2a9e91da84bde3795.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/fender_audio_passport_conference_s2_portable_pa_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/cisco_anyconnect_client_from_asa.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/manuale_istruzioni_stampante_samsung_xpress_c480fw.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/electronics_engineering_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/daily_lesson_plan_blank_template.pdfIn PDF document text
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_7a12b6ae13fd467bbe5d29582ed95e4f.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_bf4cc272800d40d384bbcc5a954db4f9.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_e614f95b50db4e8ab04c6e39a39ba4a6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/nupukuguwesimabaforogajul.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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 5504 bytes
SHA-256: 39ee75e83d806414ee2740eff866c73d012715d86de513899ef2b41b6ac12151
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10788 bytes
SHA-256: d94996a41826b85761ed739e506ebf5ff71ff1017b1737a6949153f760d4b9a0