Malicious PDF — malware analysis report

Static analysis result for SHA-256 403ef252618ef0fa…

MALICIOUS

PDF

74.5 KB Created: 2021-03-12 00:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3af0c22ca6860b273f52c2146f544dfb SHA-1: 982d87603f1ed7c49f88045175574a1e8eee5a48 SHA-256: 403ef252618ef0fae05b94d08064af7b7048446543a5c8f88acce9872641fbfb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'decoding the zimmerman note worksheet answers', likely to trick users into visiting malicious sites. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=decoding+the+zimmerman+note+worksheet+answers PDF link annotation
    • http://maxobujixeweden.sportsontheweb.net/foucault_governmentality_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5fe84ac54276b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462775/normal_602b4e8bcf8ab.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/40203074520.pdfIn PDF document text
    • http://vevapefin.sportsontheweb.net/13727629983.pdfIn PDF document text
    • http://bifinisotipa.22web.org/dark_sunset_wallpaper_iphone.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/43a0cd5c-ac32-4f2c-a1a0-1c83c0d6a566/47034213490.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_09b1f2770c964c7e9552f0e18bf13902.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e9fbfb-bdc9-454d-a140-e4ccb52c6c1d/56376324030.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/bilezulimufivuxotazukawuf.pdfIn PDF document text
    • http://zolefirujiwi.rf.gd/pulotizuxirisajevopizu.pdfIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_a3bec39690ff4b8fa0134412f2895ed6.pdf?index=trueIn PDF document text
    • http://favovab.epizy.com/57201614000.pdfIn PDF document text
    • http://gawelemuxidon.epizy.com/buy_kumon_worksheets_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c51379-207b-4a3f-a9e6-82fb9937e803/japanese_mythology_books_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/ariens_classic_824_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fb5882-ee00-489e-8c03-ac522c455474/84078610231.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/sobesugonopajowivax.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_46c71872f14b4039a1ac1559945a45e6.pdf?index=trueIn PDF document text
    • http://vujapoguxesak.myartsonline.com/96574950266.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_0e8caa4b387948cd8d1c9d08fd4cd050.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/kemebewonupirevazafawib.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 5524 bytes
SHA-256: 92b0f1c5b21302e93e9407ec6a2ec3d8d6b6302a3d0780b80bc5a16b6622349c
font_01_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 11812 bytes
SHA-256: 48141b0872c9ed0f0dc5e645c5d111a54a71421be61ef9168fd9713780e7c012

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