Malicious PDF — malware analysis report

Static analysis result for SHA-256 f828ab8bb7a81244…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 10:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cdc46884f749fbb4bbb6ee1e81cccbe2 SHA-1: be2e334cd4e1c2b55b253da73ba4de8012d45e63 SHA-256: f828ab8bb7a81244d29e2af5e23740268f694755d82000bd1e6fa0ee1893e5f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure and URL analysis strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/123?utm_term=10th+bipartite+settlement+pdf+aiboc PDF link annotation
    • https://cdn.sqhk.co/vuluzazogur/eUifNHF/gsmarena_apple_ipad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_6048ec392c288.pdfIn PDF document text
    • https://cdn.sqhk.co/kilobubag/gg6ytgf/android_tv_home_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/7iejjIm/9round_pulse_heart_rate_monitor_app.pdfIn PDF document text
    • http://kedetesedaxuwa.iblogger.org/2000_ford_ranger_4x4_fuse_box_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_601d0bf0850ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381347/normal_5ff2a3a386880.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/4655baa3-7b9e-4836-ae6e-5fa4aadf95e0/sekinubugosezor.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/kakubadavam.pdfIn PDF document text
    • http://luvubarebefu.rf.gd/lufewo.pdfIn PDF document text
    • http://rovarede.rf.gd/noripaxoworisobidili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bb19f3d-23ec-4361-9c90-147d918ec58d/94370706807.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/mopufedavutonizu.pdfIn PDF document text
    • http://fegifujeviba.epizy.com/chinquapin_hunting_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/wevinobokumilak.pdfIn PDF document text
    • http://feruvemijajo.epizy.com/vovejumivowemofofada.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_off0000e399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE399 5636 bytes
SHA-256: 865332a60db61860708fd242d2e2917208ceef0dd2ce42c98d31d6b749829f38
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 10592 bytes
SHA-256: 731e40bc3b701925407b665b85c437429d73b6228dc42067dfbc9cd17e400b53

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