Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c5313706e69d00…

MALICIOUS

PDF

79.3 KB Created: 2021-04-03 20:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b971c6e8a25cf0213814d4fcc432619 SHA-1: dfbdd5285c9f8c70cbcaff9f2111beab5bfa6adb SHA-256: c1c5313706e69d003d7a9417a3556c6c4101b8e6d5caed397c66ec8844c9b7bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs across various disposable hosting services, with the primary goal of directing users to potentially harmful websites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/wix?keyword=jesus+didn%2527t+tap+mma PDF link annotation
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/3f97b.pdfIn PDF document text
    • https://devopududifuwet.weebly.com/uploads/1/3/2/6/132696325/2827117.pdfIn PDF document text
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/319818aae80fe82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5feb87893b50b.pdfIn PDF document text
    • http://nilutafejo.mypressonline.com/reduce_resolution_mac.pdfIn PDF document text
    • http://nextauto02.ru/32965777990i3ldq.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/givatugawuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b7feb33c.pdfIn PDF document text
    • http://cancandance.org/jcpenney_sewing_machine_model_7050_partssl7wu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5fcd766ac8559.pdfIn PDF document text
    • https://wavamabixalovag.weebly.com/uploads/1/3/4/5/134525364/748402.pdfIn PDF document text
    • http://risonubokedoxav.scienceontheweb.net/biostatistics_course.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kabuzore.atwebpages.com/94145114637.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/sales_agency_agreement_template_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e96742-c610-4bef-8c4e-a0e68bbb1813/maquina_de_costura_singer_simple_3223r.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e05f723-98f5-45bc-91d7-cb47c5624435/befugi.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/pofapeneput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61be4722-4cff-4732-8391-6d4dedf37731/how_to_pair_blueparrott_headset.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/16350763233.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/roduvubepafavinep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf6d4ff-4dd6-4f33-bfd7-087df8b997ff/22784416820.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/gapuxivogetasipa.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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 5000 bytes
SHA-256: 3a5ca452132dbc43c5872fa0ae6d00ada4bcbeb15a458e10cec6c40fde8d3598
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 11016 bytes
SHA-256: 721b3fba49087e202086b17d06f01884b5ef38dfb7201c9d83fb288c837ba394

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