Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4258ef13fb991f2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-05 04:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: dbce898aae07a5c47607023933f0a9b8 SHA-1: b164077694c5afb92c87b77f803a2aec35b80af0 SHA-256: a4258ef13fb991f2b7ded40f30557c9ea84d78b524ff0f7f2409895278926e96
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URL points to a suspicious domain, suggesting an attempt to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://jumiwimov.ru/wix?keyword=11.3+geometric+sequences+and+series+answers PDF link annotation
    • http://iuts.space/free_tv_apps_for_ipad_canadaw0u2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_6027c446a1d59.pdfIn PDF document text
    • http://coolvdomaion.online/71440210374nvoz8.pdfIn PDF document text
    • http://honey-love.ru/90203976817xcr0o.pdfIn PDF document text
    • https://nafesidupige.weebly.com/uploads/1/3/2/6/132680955/vimibawetezakisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_6014073ad821c.pdfIn PDF document text
    • http://akfb.online/bhojpuri_movie_hd_pictureh4w3i.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/5768322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffd722965f66.pdfIn PDF document text
    • https://rixulajo.weebly.com/uploads/1/3/4/5/134585814/gaxunurowez_zinaji_kuxapoleboge_fojixuredi.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/3cc73d21-677f-43ca-8885-f848ca6bc6ae/28938833094.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/magazine_cover_template_vogue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef501fd0-f76a-4e67-87a5-c4112ad4f731/gelaxofagisejumovelopivet.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/44964187116.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/sumerian_cuneiform_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/4825374512.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_a2f47aaf7bbb4318b57352475722330b.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_31175f2a901749beb329da4f32718bfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1bb28f-52bc-4e60-a04a-a0b26cc4292e/tatixukuluzekelizazika.pdfIn PDF document text
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_0a3789b04a924e1b9befacc36ea0aff2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/28475092569.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 5596 bytes
SHA-256: 9fc728f6ae9c834d0f127626f001c5b7958dbadcff9d2f07d32800de69571ade
font_01_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 11420 bytes
SHA-256: 14463f38103c37cbec1984a98d78e42b746e2bd99a7abd23fd4bcf51f9ec5bdb
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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