Malicious PDF — malware analysis report

Static analysis result for SHA-256 763e97488c9fb951…

MALICIOUS

PDF

71.6 KB Created: 2021-04-02 16:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 387d4d8dddc562dd8dc4621b6bc6886e SHA-1: b0577df1741895197f233cb850694989398be370 SHA-256: 763e97488c9fb95181727ba5e9124e4a3fa72272c4977db20f141c4350eb7b16
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. The document body, though partially corrupted, suggests a lure related to a quiz, directing users to a suspicious URL. The presence of numerous external URIs and link farm characteristics indicate a phishing or scam 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://xajibur.ru/strik?utm_term=how+to+do+the+pottermore+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6062006d1f37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490918/normal_60217a32da3b6.pdfIn PDF document text
    • http://buyfastedcircle.xyz/23730514649wde8p.pdfIn PDF document text
    • http://matcobzor.ru/best_research_paper_topics_2020257ox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fe18eb296281.pdfIn PDF document text
    • http://damvglaz0.xyz/6332265540648bdf.pdfIn PDF document text
    • http://ig-copyrightviolation.com/80233459838v554c.pdfIn PDF document text
    • http://powerpoint4you.ru/pebble_smartwatch_app_for_androidb2j5e.pdfIn PDF document text
    • https://kurixaxewa.weebly.com/uploads/1/3/1/3/131383664/6015884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5ffdd86d0fab5.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/vonerezulus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5fe2bd5204704.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_72c85971a25649ce9b5f52375a083dee.pdf?index=trueIn PDF document text
    • http://bulasejazaw.epizy.com/sch_truyn_kiu_ch_gii.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_eeddb44b0b50428da87a496d626a27b1.pdf?index=trueIn PDF document text
    • http://pavebutom.epizy.com/top_best_paid_games_for_android.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_5833a31da7114790b5894b19879906fb.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_8ad4903d25f74209b0241d4bcdc641b2.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_f84c6e97c8e34d2f8c94fe1fc987b77a.pdf?index=trueIn 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 5008 bytes
SHA-256: b49b9b176aa3a1e4cd4480067c76bfecb0fc2b2a34f08c640c34aaa5b64235dd
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 11876 bytes
SHA-256: 3b5a0b3337e044bc91d476eeaed40389907e1dfb04536bfe2dbd8c7088b62fc7

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